Don't doubt Barr's intentions...instead listen to what your man Ron Paul had to say about him...there's a reason why RP is not doubting Barr's intentions like you do
"I think so. It doesn't mean that you can look at his voting record like you look at mine and say there was never any infraction. That doesn't mean that he can't represent these values. He's saying the things he should be saying. He's joined the Libertarian Party and he presents these views and he talks our language. So I do really believe that he can have a very positive effect in this campaign and let the people know that limited government is a very, very important message and that people will have a chance [to hear it]. That gives everybody a choice in the matter."
"I think he's running a very important race, and I'm encouraging him. I haven't endorsed him, but he's saying the kind of things I'd like to be heard and said, and I hope he does real well. But we also have Chuck Baldwin who runs on the Constitution Party [ticket]; his views are very close to mine, and he worked very hard on my campaign, so for me to pick one or the other is not easy. I hope they both get a lot of votes."
http://www.nolanchart.com/article4172.html