anything can be used helpfully or harmfully. ALOT of good can come from its legalization - though that doesn't mean it wouldn't be beneficial to educate on the boundaries between use and abuse. prohibition doesn't stop abuse any more than legalization does. though at least as society starts integrating, regulating, and educating about it, the potential to abuse goes down as the awareness generally goes up about the differences...
I agree that is why we say never over do anything just keep it balance.