I mean, realistically it's probably the only way to actually convert bigots. Bigotry that stems from emotion (like fear, a lot of the time) can't be fixed with facts or re-education, it can only be changed through positive emotional experiences. Bigotry also largely festers when people are isolated, which can also only be fixed through societal reintegration. People are a result of their environment and changing an environment will change a person.

It's a really complicated issue imo, on the one hand you can't force "normal" people, especially people of color, to be around racists in an effort to "fix" them, but on the other hand isolating them only makes them more racist.