Quote from Ghost of Cutten:
But how does this support criminalisation of drug use? Something being undesirable, or having negative side-effects or bad influences on society, *in no way whatsoever* suggests that the best response is to make it illegal.
The way to decide, on purely utilitarian grounds, if something should be illegal or not, is to look at the net positive and negative consequences if it is made illegal, versus the net consequences if it is legal. Something can have bad effects yet be less harmful overall if made legal than illegal - for example smoking, alcohol consumption, adultery, lying etc.
Therefore to support an argument for hard drugs being illegal, it is not sufficient to demonstrate that there are negative social consequences to drug use. You must demonstrate that the consequences under a prohibition scheme are, on balance, less bad than under a decriminalisation scheme, or legalisation with regulation, or total legalisation. So far you have not demonstrated that.