Prohibition doesn’t give society tools, it removes them.
Take prostitution. Legalisation immediately leads to registration of hookers (blocking most human trafficking), gives oversight to inspectors, forces safety standards, allows for checks on welfare etc… It also removes criminals from the chain, pimps, violence, drugs etc… If you do a little research on this you’ll see it’s the better option. If you are a moral person your imperative should be on keeping all parties safe. And you have to realise prohibition never stops it.