I do agree, to an extent. The problem that I see with unregulated addictive and harmful drugs is that they don't ruin only the user's life. When meth or cocaine or heroin are used in a pregnant woman's body, the baby's chances of making it to term are decreased. If they do and survive their withdrawal symptoms, their developmental problems are increased. And women who become pregnant while addicted aren't always able to kick their habits. Even when the users already have children, as you see in the news time and time again, the children are often neglected and fail to get the proper education and nutrition that their peers are getting. So why "just let them do it"? I get the libertarian viewpoint on most things. But dangerous and addictive substances just don't deserve their place in society. Just my opinion.