I wasn't aware of that. Are you saying the Libertarian will not strike first when he knows a fist is coming at his face? Will a Libertarian shoot first if someone points a loaded pistol at him and knows they are going to pull the trigger?
The libertarian as envisioned by the party's founder Hopkins (and his ideological model Ayn Rand) would certain react with pre-emption when faced with an imminent attack. Today's Libertarian Party, however, is being run by people who are so pacifistic that they would not even dare to use force reactively, let alone pro-actively.