Because screwing each other is fun. Super fun until you're the one targeted. Then they become nancies whining that it's suddenly come to far and they see the error of their ways. Until they get back to believing they have the upper hand and their shortsightedness and short-term memory lets them forget what happened the last time they supported fascism. Then it continues and preys on frustrated and irritated youngsters filled with fear and hatred looking for a misguided release of that pent-up and equally misguided rage.