Actually they have. Many times. They mainly want to defund the police and use these funds for other social programs meant to reduce crime overall. Social housing is one of them. Legalizing drugs, sex work, increasing wages to allow people to afford their basic needs like shelter and food, providing better access to mental health services and social workers, etc.

Conservatives on the other hand want the opposite. They want to defund everything else and give it all to the cops who are just going to beat up and arrest people who are clearly in need of help. Can't afford shelter? Camp in a park. But that's illegal. Can't afford food? Steal it. But that's illegal. Can't get mental health? Go in full mental breakdown and use illegal drugs to try and self medicate. But that's illegal.

Get the point?