As much as I like Paul's fiscal views, this is the main reason that I would never vote for the man:
If he were President during WW2 he would have coddled Hitler. We'd all be speaking German right now. I wonder how Paul would have felt had he been President, not killed Bin Laden, and we suffered another attack on our main shores killing thousands of innocent Americans.
Honestly, I don't know of any other serious politician on either side of the fence that has any credibility that agrees with him on this issue.