I thought about it, but if I cite sources, I will be citing racist people. Not something people enjoy reading.

But you can find the same discourse in most famous racists of the world, at least currently living.

If I have to cite a source, Tommy Robinson (here comes the downvotes) constantly talks (and breaks) about the omerta surrounding the trials he reported on, which made that the rape gangs could proceed for so long with so few hindrances. Go through the list of people recently suppressed from Youtube and you’ll find the same (unadressed) logic.

Concerning root events, they are often private, so you have to know the person personally. But go ask around you when people became racist, they’ll often tell you one specific event. It’s interesting to go interviewing an enemy.