I beg to differ, kind Sir or Madam. When you lock them away, they spread the hate even more, making things worse. Instead put them together with immigrants, their families, individuals. Daily, for a long time. It’s easy to hate a concept, it’s almost impossible to hate people if you get to know them. Show them their wrong ways. Humans are social animals (except hard cases of sociopaths or psychopaths - btw it’s not that common, as some want to make you think, most - by far - sociopathical behavior is learned and can be unlearned)