Earlier quoted context omitted.
> It is capable of completely and permanently altering a person's personality in negative ways Yes, it should be used in moderation - like alcohol, which is a more dangerous, legal drug.
Pointing out the existence of a worse legal poison is not a very good argument for the legalisation of another one. Perhaps it should not be used at all.
Well yes, they are criminals who have broken the law. Your argument is defeatist; drug prohibition works quite well in places like Japan and Singapore.