Libertarianism. To me, it's basically "being a five year old" dressed up as an ideological viewpoint. It's a denial of moral responsibility, selfishness made into an eternal, unalterable principal.
To be fair, many libertarians have a genuine belief in their principles, but I often get they impression that they just haven't brought their beliefs to their logical anarchistic conclusion. (The same can be said for many socialists, of course, but their ideology, at least, doesn't lead one to the sort of selfish behavior that libertarianism would.)
