Those protestors mostly went to government schools, and were likely radicalized because of their time in them. Being in school doesn't make the hate in your heart go away. It forces you to rub shoulders with the exact kind of people you believe are subhuman - and even gives more ammunition for them to use in their mind when arguments against racism are made to them.

There's a reason why conservatives are so obsessed with school choice, LGBT book bans, etc.