alt Hacker NewsSomeone with a tendency towards racist generalisations might start disliking a particular group due to the zeitgeist identifying "disliking the behaviour of a political entity" with "disliking all members of an ethnic group", though. If they previously didn't hold any such views, then they would go from "not racist" to "racist". (If you disagree with my category boundaries, you can construct your own similar example for your preferred category boundaries.)
Just because something's wrong, that doesn't mean it's illogical. A logical conclusion from flawed premises is still logical.
It’s illogical even if you think racism is good.
Your reason for them becoming a racist depends on them already being a racist.
Anyway, we’re going in circles here. Some people are racists because they are assholes. Many people are racist because they are trained in a culture that encourages racism against certain groups.
All racists point to the actions of individuals as “evidence” or “justification” or “cause” of their racism.