About 20% of US GDP is social spending. What percentage of GDP will get us where we need to be? Why does California have so many notorious problems when, compared with many other states, its social spending is so generous?

Social systems are not as simple as "give people more money", particularly when millions of people have already been socialized into criminality. Thinking this is a total misunderstanding. Most criminals are not stealing to get bread to feed their family. They commit crimes because a) it's fun b) it's what their peers are doing / needed for their social standing and c) it beats working for a living. Yes, a well-socialized conscientious person would never do this except in cases of severe hardship - but that's not the reality of what's happening.

California notoriously does not house the homeless nor feed them, leading to massive amounts of crime by people with mental illness having to live on the street. It also has some of the worst wealth inequality on the planet. When a 1 bedroom shack costs >$1M, you've basically taken a sledge hammer to any concept of a society.

20% of US GDP goes mostly to social security, imagine how much crime we'd have if we didn't spend that and every senior citizen had to scavenge for food! I would say at least 99% of of the money we spend on police and the military should instead go to social support and local infrastructure improvements.