I used to be a pretty hardcore libertarian. The standard libertarian arguments only really work when you have a mostly libertarian system already however. They tend to have problems when you have some form of a welfare state such that individuals who for whatever reasons are unable to support themselves end up being supported by the state. That in itself is a classic libertarian argument - the logic of welfare inevitably leads to government overreach in all areas of life because the state has established a financial interest in preventing people from engaging in "harmful" behaviors.