My mistake for engaging with you; you have checkmated me. You are asking me for my sources now, whereas I should have asked you first what your source was for your claim about "nobody choosing to do evil". Alas, that now looks weak and desperate.
Many collaborators I've talked to have shown confusion about why they should do things to cause some far away revolutionary improvement to their own lives, or even less the lives of others, when it would involve putting themselves and loved ones at risk.
Like not only do they feel the risk is too great and the payoff too little. But they also can't comprehend what would motivate anyone to act that way. Sometimes they even insist that revolutionaries must be insane or mentally deficient.
But I don't know if it's the case that people make a decision to be this way. I think it's just the default way to be, given a relatively stable life.
People won't really be able to account for why they became this way, or think of a time when they weren't this way. To them it will just be common sense, while revolutionary thought will just seem dangerous, anathema, and basically unthinkable and wasteful.
I think it's like a mental block that evolved to let us form stable social groups. And I think that certain circumstances can unblock it.
In particular I think that a person can get so traumatized by the state of affairs and things that happen to them that they have a strong reaction that causes them to give up hope for getting rewarded by the current regime. Then a person begins investing significant portions of their effort not in just surviving the current regime, but in overthrowing and changing it in a positive way. They begin to live on the hope of justice they can bring for not only themselves, but also others. They see their own lives as irrevocably altered by the trauma, and become agents for the cause of breaking that cycle. To them, the dream of a future generation not having to experience that trauma can be more motivating than thoughts of their own survival.
I believe that just like the first mode evolved to keep societal groups stable, the revolutionary mode evolved to let groups compete with each other and achieve beneficial new power structures.
