^mmk
Although it is not harmless, it seems as if it poses much less of a danger than alcohol does - both to the user and the people around him/her
But yeah, you never argued against that, I'm just making sure you realise that just in case you hadn't already
As for your claim that legalisation will increase use, you are ignoring a lot of factors that come into play
Say suicide became legal tomorrow, would the amount of people commiting suicide increase substantially 'as they will no longer believe that' suicide is a bad thing.
Similarly, how many people would go out and start shooting H if it became legal tomorrow? Not many. That's why it is education rather than social stigma that has the greater effect here.
Although some sort of stigma will be lost for the next generation, it isn't something that should be too worried about
You would hope that education (without hyperbole or outright lies) alone should prevent people from using certain substances
Legalisation will make way for safer and cleaner use. You will know what you're buying, and some people won't have to resort to sharing needles which will lower the spread of infections or STIs. Amount of overdoses will be expected to decrease, and the number of people willing to seek out help for their addiction may also be predicted to increase. It wouldn't be too surprising if addiction (perhaps not usage) decreased.
People won't have to resort to substitutes such as krokodil in Russia, or they won't have to risk picking poisonous mushrooms or mouldy ones when searching for magic mushrooms.
Magic mushrooms are as close to harmless as you can get as far as I know
Also consider the drug war. The drug war alone should be enough to compel most people in to wanted some sort of drug reform. It seems as if legalising all drugs is the only option to end the blood shed, with over 15,000 people being killed in 2010 alone.
An increase in use isn't such a bad thing, as long as the users are educated well enough on the topic and are using 'safely', just like people are advised to drink 'safely'
Although use may increase, ultimately - or from a utilitarian POV - it may be that legalising drugs is the right thing to do