As far as Libertarians and their viewpoint, I generally understand what they're saying. But what happens is it butts up against the idea of "Can I belong an entity that would ask me to permit something of which I find to be morally wrong?" And I can't get past that.
That speaks a bit to your view of where and how the onus lies, and what the 'default' of things is. The default state for everything is "not prohibited", and there really isn't a more precise way to put it. Government can not "allow" anything. It can only prohibit. That may seem like a distinction without a difference, but it is far from one.
So the proper question is, can you belong to an entity which does not prohibit everything you think should be prohibited? And that question should be carefully considered against the fact that while you like the morality government might be enforcing today, you may not like it next term when someone elses morality if being enforced on you. And also, considered against a background of sharia, like Big Dog said. Why is your want of certain prohibitions based on your morals, different than someone elses wants for a different set based on their morals rather than yours?
The libertarian position (if I understand it correctly) is that we expect government to 'allow' nothing, since 'allowing' isn't governments place. We expect government to 'forbid' almost never, as governments proper role is to protect the rights of the individual rather than interfere with them. When those rights become endangered or interfered with, only then is it governments proper place to step in. Either way, that is my own personal opinion. A right jackboot in your ass has no greater appeal than a left jackboot in your ass. I have no claim against any ones life or liberty, and I reject any claims made against mine, openly or furtively. I resent both with equal measure.
“To secure these rights, governments are instituted among menâ€, with one of those rights being 'liberty'.
(I took no offense by your post, and intend none by this one, but I do think liberty in America need to be discussed far more than it is)
CMD