Why can't we?

Why can't we just let anybody do their stuff and let others do their stuff? not doing bad stuff, too. Just let people do stuff without hating.

Because then racists would lack identity and the security that comes with it. Without being able to belong to a group of people that exclude others that act as an extended family, without that sense of belonging they would have to deal with the fact that they don't know who they are as a individual.