The biggest factor is that the police simply suck at doing their real job but have worked hard at making sure the rank and file doesn't complain in public.

"never complain" is a rule in all sectors in sweden. Makes people feel isolated and makes them think nobody else is facing the same issue as them.

They accepted a lot of migration but then expected immigrants to be content with being extremely poor and with no way to improve their condition and got surprise picachu faces when they decided that crime was an appropriate way since no other way existed.