Society functions while people have access to guns too, yet there are still consequences to that choice. I am pro legalization of most drugs, but meth does give me pause. No one smoking a joint or tripped out on opioids has ever attacked me while screaming at ghosts in the street, I don't know enough about the role of meth in those kinds of instabilities but anecdotally meth, and alcohol too, sure seem to cause a whole lot of trouble in my city.