I interpret the question as being about how a race of warriors could maintain a gap between, on the one hand, being violent rapists and, on the other hand, abhorring cruelty. You want them to wage wars, plunder and abduct women, but in the same time express strong opinions about the lack of kindness in humans.
People are very compassionate, and go to lengths to fight injustice and barbarity. As long as it doesn't interfere with their way of life, that is.
What you describe is not that strange at all. It's already inherent in human biology and I see the phenomenon all the time among my fellow westerners; I see it with people of many ideologies.
@DWKraus mentions the ruthless rich and others mention racists, but, perhaps paradoxically, one could argue the contrast is just as large on the left. It might be they behave in a more "caring" way than the nationalists, but they also think of themselves as more caring, leaving the gap just as large. There are, of course, many many exceptions (perhaps even most people?), but the pattern is clearly there. Let me explain:
A person on the left might care deeply about human rights and be quick to condemn people they think are breaking them, yet they ignore the problems in their own behaviour. Slavery is bad, but they buy clothes and other stuff made by people earning $1 a day or even less. Phones, on top of being fabricated by poorer people than those who use them, often contain metals mined in terrible conditions, or even conflict metals.
Speaking of electronics takes us to pollution. The mining and refinement of raw materials to make computers, phones etc doesn't just frequently harm those doing the work, but the people living in the surroundings. Used electronics are then dumped in all sorts of places (see for instance Agbogbloshie) where it poisons people and environment alike.
Production of clothing, cars and all sorts of other things pollutes to different degrees as well.
Now, the point is that people know about these things. For food, and maybe even clothes, they might choose some degree of "organic" options. Few, however, have all their clothes made by fairly paid workers, of locally grown fibres, dyed in a way that is non-toxic along all the production chain. You can buy clothes second hand, buy few of us abstain from buying a smart-phone less than a few years old. Many people own cars much larger and newer than they need.
A person may care so much about their fellow humans that they attend protests against racism, gender discrimination, or even the the hurtful misuse of gendered pronouns. Don't get me wrong! These are good things, and I'm all for them. What I want to point out is the contrast. The same person may change their phone every other year (or even more often!), dress in new clothes and travel there in a 5 years old large car. And I've not even started about green house gas emissions yet!
Cars emit carbon dioxide, but the production itself of the car can produce just as much emissions as the driving it does in its lifetime.
Eating meat is also problematic. There are estimates saying half of our greenhouse gases stem from food production, and meat and dairy constitute a huge part of of this.
The very justice-aware person mentioned above might drive, even fly occasionally, eat meat every day, and overall live as if they don't care about the climate. If they're a vegetarian, chances are they eat a lot of cheese.
I could go on to other aspects, but I think I've made my point.
There are people who gets a lower salary solely because of their gender, people forced to conform to a binary gender system and people who run run a 1/100 000 risk of being shot by the police instead of the average 1/1 000 000 (numbers made up!), and this is terrible. Is it more terrible than the horrors fuelled by the way of life of our hypothetical activist? I would say they are most certainly not. No matter how organic, fairtrade or whatever marking's on the product, western level consumption of stuff isn't sustainable. And deep down our activist knows this!
People choose what to be upset about. Again, don't get me wrong: it tends to be important stuff! It also tends to be stuff that doesn't require much change in their life. And, by strange coincidence, it tends to be stuff that doesn't trouble the people in power too much either...