The cops are acting like they need the power to arrest people for using drugs to enforce the laws against other stuff. There's your problem.

Loitering, camping, and using drugs in public should all still be criminalized. If lefty policies inhibit enforcement of that, you're going to have a problem with or without drugs.

Also, I never supported legalization because it's good for the homeless. They've already failed. Decriminalization means keeping some children from becoming homeless for no reason. one should count every time that's happened.