I'd think the reason for terrorism will most often be connected to percieved injustice. If some organization does something very unfair, and the state, which is supposed to protect it's people against that does nothing, it might lead to others standing up and saying: i'll do something against that.
While in some cases that's considered fine (a rebel trying to kill an evil dictator), other cases might be considered wrong (a rebel killing a dictator i think is not evil). In both cases it will probably labeled terrorism by the state, in one case the guy will later be considered a hero, in the other case not.
Terrorism is always about having different point of views.
So, let's create a scenario where this happens and leads someone to target our TerraFormCorp (TM).
TerraFormCorp is a nice, triple A, intergalactic company specialized in creating wonderful worlds for mankind to live in. They are the most advanced, skillful and creative company on the market. They employ literally millions of employees, and pay exceptionally well. From their marvelous R&D department, who constantly work on improving terraforming, and adapting earth organisms to other planets via DNA-modification, to their workers who travel to other worlds to take samples, prepare the soil, install the terraforming machines and move local species to special habitats, so they don't go extinct. Everyone is happy, well paid, has health plans and pension plans. TerraFormCorp is a happy company. A clean company. A good company.
TerraFormCorp is the embodyment of evil. Yes, they have nice flyers, a supercool webpage, and are very skillful at making themselves look good. But you know better than that. You know the truth. You worked for them. It's true, they pay well, and as long as you are a nice company trophy and do your job like they want you to do it, you are probably fine. If you have no conscience and no shame. All employees are required to live in special TerraFormCorp settlements, where you are brainwashed all day. You can only have TerraFormCorp friends, TerraFormCorp food, TerraFormCorp movies, TerraFormCorp everything. And if you don't follow that policy, you are out. Hell, if you take a non-TerraFormCorp-conformist shit, they send you a warning. The working conditions on the planets are shit. You get bombarded with strange bacteria, viruses, toxic gas, and all that shit that is on foreign planets. Yes, free health care in TerraFormCorp facilities is nice, but it doesn't help you if you die at 40 from all the shit they make you take during your work. And let's be honest: who gets all the riches? Well, yeah, they pay nice, but that's just a diminuitive piece of the cake. The sums they take from governments for terraforming are enough to BUY half of earth. TerraFormCorp ? Thanks, but no thanks.
We are sorry to hear you have problems with TerraFormCorp. We constantly work on new technologies to improve well-being and health of our workers. Sadly, terraforming is still one of the most dangerous fields of work in the universe (rank two after feeding pills to 6legged cats from planet sphinx). But TerraFormCorp is constantly working to make even this a safe field of work. Compared to our competitors, we suffer 60% less fatal accidents, and our workers have an average of 18 years longer lifespans. (compared to our competitors). It is true that we encourage our employees to engage in corporate-sponsored activities, as our scientists have carefully created health and leisure plans that are optimized for the stress and pressure our employees face. Of course we do not punish individuals that choose to engage in other activities, as long as they do not pose unnecessary risks to our workers health or productivity.
TerraFormCorp is pure evil. You think they be big players? They are bigger. The freaking company has their headquarters on their own planet, believe it or not, they do! Now what they do is, they wait for a government to go come at em, and then they make a deal with them. The government asks them to terraform the planet. You see, they are a contractor, yes, but they own more lawyers than the government does. And they are so freaking big, you can't mess with them. Their prices are sooo high, even the government can't really pay them. So what they do, they take billions of dollars from the government, you see, and then they terraform the planet, but they also have a contract that states that they OWN parts of the planet, to make up for the part the government couldn't pay. Yes, they have to sell it back to people from the planet of the government. And of course they make the land they own the most beautiful in the universe. No denying that, man, the gardens they build are just wow, man, but you see, they own that shit now. And then they sell if for a fortune back to the people of the government that already paid them for doing that. So they take OUR taxes, and make a planet nice and stuff, and then they sell it to the rich people up there so they can live nice. But do the rich people pay tax? No they don't. We poor people, we pay the taxes, and then they make a nice planet for the rich guys from it. Sure, a few of us may live in the areas where they couldn't built nothing nice, and that's mighty fine and all, or at least that what's they tell us all day long, but they never show the camps where us simple people need to live then, right? They only ever show the nice areas, but they are for the rich only. And even if you get a place in the poor slums, they even charge you for the flight there, taking every last dollar they can get from us.
That's what TerraFormCorp is. Evil, money-greedy bastards that only work for the rich.
TerraFormCorp? Those guys are awful. They terraform planets. While they do create small habitats for the local lifeforms, that's only an illusion. Like a zoo where the new colonists can go and see how the world once looked, before they just destroyed all wildlife. Billions and billions of unknown species, and they sent 10.000 collectors at maximum? For only one month? How many species do you think they recover? 4%! They only save only one out of 25 species! And then they force them into small habitats, efficiently ending and natural form of evolution and life on the planet. And all of that so some rich dudes can have some nice houses with outlook to some artifical mountain.
We are sorry to hear you do not agree with TerraFormCorp policy on handling native wildlife. Our collectors, all of them studied experts on wildlife, botany and microbiology, careful collect and sample the DNA of all species they come across. Sadly, the global changes to climate and atmosphere force us to move some less resilient species to local habitats. We create these to match the original environment to 99,99%. All species that can possibly relocate are placed there, while we preserve the DNA of all those who cannot be moved in a genetic library. Even though time restrictions on terraforming are tight, and we often work under enormous pressure, we take a whole month carefully collecting. Our collectors wear environmentally sealed suits, so we do not contaminate the natural wildlife with foreign organisms. TerraFormCorp works hard to protect mankind and the rest of the universe alike.
As a government official, i am happy to announce that we work together with TerraFormCorp for colonization of alpha draconis 4. In only a few years, the company will have created a wonderful new area to settle in for our population. Our planet struggles with overpopulation since 40 years now, and finally we can remove the restrictions on having chilren, and strict gender segregation for non-sterilized citizens. Sadly, terraforming a planet is incredibly expensive, and we had to pay the equivalent of 12 years's of global planetary production for them to do it. TerraFormCorp was as nice as to cut it down to 6, taking only 10% of the surface as private property, that they need to sell back to our citizens. This way, all our people profit, and the richer people contribute more by paying for the land they then own, while we can give out land to poorer citizens for free, allowing wealth and prosperity for everyone. TerraFormCorp really helped our planet end it's long-lasting struggle for more space and growth.
I think this paints a nice picture of a company that might seem evil or good, depending on the viewpoint, and gives some nice reasons for terrorism.