This statement is factually incorrect.
http://www.youtube.com/watch?v=o0TBE-pcEi0
http://www.youtube.com/watch?v=ZZi45Mf6jYY&feature=related
Government is required to enforce property rights in a lawful way. Yes, we can kill and hang anyone who emposes their will on them, but I don't think that's what we are looking for. We are asking our government to enforce property rights, and the respect of that is a facet of liberty.