I won't talk about the controlling attitude of today's Libertarian Party, which appears to have drifted away from its roots. Originally, the philosophy of libertarianism was about equal measures of personal freedom and personal responsibility.
You could do as you want with your body, but nobody should be forced to pay for your lack of judgement. Libertarianism would do away with the dole, with "free" health care, etc.
In the past, what kept bad behavior in check was the lack of governmental safety-net. The people who insisted on becoming alcoholics died on the streets, and removed themselves from the gene-pool. Women who had sex outside wedlock found themselves with kids without support, and men unwilling to marry them and support another man's bastards.
The way to get back to morality, is to remove the safety net which facilitates immorality.
The "Libertarian Party" has become the opposite - do whatever you want, and don't be held responsible for anything.