When a child first hears an adult express a racist attitude they are confused and don’t know what to think. They may not even understand who is in the group being maligned or even have a concept of groups. And even if they do, they may think “huh? I didn’t realize they were all bad.” But like a lot of things you hear as a kid, it just kind of sinks in.

And that seed has been planted. From there, confirmation bias does the rest. Anytime that growing person sees a member of that other group doing something wrong, they notice it and think “hey that’s what Dad was talking about.” Any such missteps from a member of that group get assigned to the whole group. Of course, people not in that group are judged as individuals. Classic in-group / out-group thinking, which is universal.

By the time the person is grown up enough to think properly, they may have accumulated lots of these moments of confirmation bias. By then it’s likely that they start assigning blame to this group by default. Litter on the ground? Probably one of them. Something got stolen? Probably one of them. And of course if race relations are inflamed in general there may be plenty of active fuel for the fire. A gang of “them” beat up one of “us.” Now it’s basically war, and the person we’re talking about didn’t have to do anything or be a direct victim of anything. It’s all just socially transmitted and then reinforced through observation with cognitive bias. Incidentally, this is why we should never stop talking about racism openly, because that’s the only way to interrupt this process going on in the back of peoples minds. Yeah, sorry, Morgan Freeman.

I am with you as a fellow lazy person who can’t spare the energy. But I can see how easily others slip into it. Hitler of course used it to galvanize people and turn that in-group / out-group energy into a political force.