Libertarians vote and likely vote in large numbers, they are typically well versed in the issues. What sort of fight did you have in mind? Milton Friedman described himself as a libertarian with a small “L” but voted Republican out of necessity. Most libertarians would probably describe themselves the same way.
That's exactly right. It's no different than communism in that respect.
The idea that everyone work together, share in everything and it's all equitable would work if everyone had the morals and work ethic to do so. But that's not the world we live in. From the time of the Common Store system in Jamestown that failed so abysmally, till now, nothing has changed.
We don't live in the kind of ideal world libertarians say should exist for their system to work, therefore their system will NOT work, ever.
That is why libertarianism will lead to anarchy.