So I'm a dictator of the world, who seized power after a global collapse and I maintain control of the world with my giant army of killer robots - tanks, planes, androids, and so on. Things have been pretty good, and I've been able to be fairly benevolent, since no one can face down my invincible army of robots. The current designs are built to fight armies, but work pretty well suppressing rebellion. I rebuilt society to a 1950's-style tech level (except for my robot army, built by robotic factories with metals mined on the moon and difficult to scale up at this point), and I only modestly suppress free speech. Sure, there's an occasional massacre, but I really think everyone and everything is better under my rule, and want to be as kind and merciful as possible. I AM, after all, the newest incarnation of Vishnu, but I hate to make a big deal about that. All I want is to usher in the new golden age.
Only then extraterrestrials showed up, bringing disruptive technology in the form of self-replicating nanites. Some have been great (medical nanites have cured most disease) but there are nanites that transform ordinary people into "super heroes" by giving them access to extradimensional beings able to bend the laws of physics, predict the future (sorta) and manipulate probability to dodge bullets. Some are even teleporting and using telekinesis to pull down flying drones. There are serious side effects to the nanites (like alien possession and frequent insanity) so many people are reluctant to get them until they feel they have to. The nanites for heroes can be administered from a little blood, making new heroes, so things could grow out of control quickly due to the ease of transfer.
At first I could blow them up with big bombs and gas them, but the collateral damage is pretty bad, bombs were less effective than I hoped, and they are starting to use gas masks. The aliens say using nukes violates some kind of interplanetary law, and I didn't really want to destroy everyone anyway - you can't rule dead people. Throwing legions of robots at them is getting absurdly expensive and the supplies are ultimately limited. I may need to come up with some better designs, although I don't trust the engineers much. The nanites only work on people, so no super-robots or animals.
I never built a cadre of elite loyalists since I think other people are inherently untrustworthy (and I relied on my army of robots), so when I tried to make my own superheroes, it went badly (traitors!). I'm working on genetically perfect moral elites (a "master race") to carry on my legacy, but engineering morals and ethics is harder than I thought and it will be 15-20 years until I can upgrade them to heroes (what could possibly go wrong?). While I trust my robots, I don't trust true AI, despite being able to control programming. I'm expanding propaganda (mostly about how great I am), but so far, people just won't accept that I'm a great guy and they're better off with me in charge.
Meanwhile, heroes are getting out of hand. Billions of people will die if these possessed and often insane heroes take control of the world. The more I suppress the people, the faster they spread the nanites. I'm starting to think I'm not very good at being a world dictator (and self doubt is dangerous). Yet I don't want to be evil, per se.
How do I stop superheroes from disrupting my "perfect society" until my ethically perfect master race can take over and institute a 10,000 year Reich utopia?
Ideal solutions may involve engineering (my dictator would love better robot concepts), but should keep brutal suppression to a minimum. Social or technological changes could work, and the general society has minimal technology but can be upgraded in time as needed (although the optimum is keeping tech in the 1950's - I don't trust people to use it well). I'm getting a little desperate, so temporary fixes can work until my master race comes on line.
If things get too out of control, I'll have to abandon Earth in my stolen alien spacecraft, purge the unclean in nuclear fire (alien laws be damned) and rebuild elsewhere. Please help me save the Earth from destruction!