Don’t just put them in jail. Let them work with immigrants, daily, put them as a guest into mixed families, show them their wrong ways. In jail they just spread the hate even more. It’s much harder to hate real individuals than unpersonalized concepts. We - as in “we all, humankind” - have to take responsibility for these things, everybody a small bit, it doesn’t hurt. Just lock them away does nothing, it actually makes things worse in the long run.