A libertarian government has an obligation to protect the lives and property of its citizens. The reflexive opposition to the aggressive pursuit of the War shows not only an abandonment of this libertarian value, but it also shows the Party as being no different from any other party. They've staked out a position simply because it's not what "the other guy" is saying. Right or wrong had nothing to do with it; only political expediency.
I happen to be a Republican-Libertarian also. I almost voted for the Libertarian Party this year, however the war on terror issue stopped me for voting for them. Basically sticking head in sand and pretend the problem does not exist is not the solution. I like Bush, however, there are few issues that I disagree with him.