Oh, nonsense. They're easy to ignore, and there aren't that many.
Grownups can handle living in a truly free society. In many ways, LF is an experiment remarkably akin to what a real-life libertarian society would be like. And I'm not a libertarian. Ultimately, I personally don't think libertarianism can fly (for long) - I much prefer the freedom of a Constitutional Republic. But one like the founders built, not like what we have today.
But that said, Liberty Forum, while not perfect, ain't half bad. Just tune out the ones you don't want to listen to - and stay off of threads where they hang out - and it's quite an enjoyable place to be.
Have you counted them lately?
Anyway, many folks would be able to go in and tune them out, or ripping them a few new ones. But MOST people don't want to even go near them, far less argue with them. Most people on a board are lurkers, and most of them will go away rather than have to deal with people like The Skunk, who isn't only a nazi but certifiable.
The jihad group aren't there for the debate. They're there for the recruiting, sucking in the ones who like what they read.
Kind of like how I lurk on FR lately.