I think the drug related part has more to do with the fact that you can buy drugs from other country, just like they've forbidden you even buy drugs from Canada online - even if they are good drugs. They just don't want you to use anything that isn't from an American company.

While some online drugs may actually be dangerous to people's health, and it's obviously risky unless you know what you're doing, I think education on this issue would be much more effective than legalizing banning of online stuff.

I mean, people with common sense should already know that they need to be careful what kind of drugs they buy online. I don't think the Government's intervention is mandatory even for that, and just like trying to ban most everything online, it will probably hurt more than help.