How dare you have an opinion!
Libertarians don’t want you to have an opinion contrary to theirs.
If you are not for sex and drugs for all without limit, then you are all kinds of bad things.
These are the only things libertarians are interested in.
The Liberterians were not always associated with fringe causes. I’m not sure how/why they evolved that way. But Americans have ignored 3rd parties for so long that they get dominated by fringe causes when the more normal supporters give up and revert to the “2 parties” that are promoted by the MSM. Where’s the Reform Party today as an example? They gave up. Perot even tried to use the TV to reach people, with his own money, but he tried to talk sensibly to them instead of entertaining.
The consequences of which all result in calls for more statism and socialism, thus defeating the whole libertarian “I’m a social liberal but a fiscal conservative” type of argument.
As far as 3rd parties, I’m far closer to the Constitution Party than to the Libertarian partiers(oops!) party.