Crystal Meth is not the same as Pot on a number of levels.
True. Doesn't mean a person shouldn't be able to fuck themselves right on up if they want to.
The manufacture of crystal meth has put a very severe strain on our emergency rooms and burn units (seriously, a large percentage of patients in burn wards are people who's meth labs have blown up).
Legalization would reduce the number of basement meth labs, just as legalization of alcohol pretty much wiped out backroom distilleries. The safety of manufacture is a reason to introduce the government control that comes with legalization.
"I know some of you are going to say 'I did look it up, and that's not true.' That's 'cause you looked it up in a book. Next time, look it up in your gut."
-Stephen Colbert