Because a) we don’t want to be the baddies, we want instead feel good despite walling ourselves from the problems and poverty we at the very least contributed t

Because a) we don’t want to be the baddies, we want instead feel good despite walling ourselves from the problems and poverty we at the very least contributed to or at most were the primary cause b) it has economic benefits long term c) actively deporting people costs money d) making it possible to easily deport people erodes rule of law and all the nice things we all like. The problem fundamentally is living in a nice place and not really contributing to making the place so nice. Everybody wants this privilege and there is of course the market and the price for having it. Real answer is the same as with drugs — be the mafia yourself