because we, as progressive city, shouldn't hurt criminal's feelings, they are people too. Also what's with this gestapo idea of telling other people what they cannot do at their wish in public? /s

Sarcasm aside - only that much can be done by the police if there is no point in doing it. Let's not forget about DA office with revolving door, making sure anyone apprehended will be released and at the same place tomorrow without any consequences to their actions.