It happens slowly. They'll make some false potemkin villages out of a big city or two, and the resulting crime exodust will send voters that love that dumb shit. They rarely check their premises, it's always well intentioned but the execution didn't work out. The moneyed people leave to other cities bringing the same thoughts and politics with them, which starts the circle anew. State/fed LE has to pick up the slack, meaning county policed areas would become more popular, likely with more urban refugees, which spreads the rot. Then the Feds can be the great villains to the scrappy, humanitarian non-police. It spreads with the engine of prison/bail/racism reform advocate organizations and their gaggle of corps cowed and blackmailed into huge donations.
They want to create a world devoid of consequences. No shame, for everything you do is righteous if you choose for it be. No responsibilities, because everything is owed to you by a hypothetical other who took it from your ancestors. No accountability, for no choice is ever made, all crime is a result of societal forces.