If there was a hypothetical group that if they had a single drink went into a random, murderous rampage you wouldn't support rules against them being allowed to drink? Why not? Because that rule doesn't apply to everyone? Why does that matter?
You're factually incorrect though - the basically only contemporary state that succeeds in having low crime without being made up of purely people from genetically low-crime populations has a list of different treatments that people from different countries of origin are subject