It depends on which version of "decriminalization" one subscribes to. If it means not locking people up for possession then that can keep people out of the prison cycle. It means people will be less afraid to ask for help with their addictions. But if decriminalization means all drugs can be openly bought and sold, THAT won't help. Marijuana is one thing, but allowing carfentanil or rohypnol to be easily acquired by all would end very badly.