Much like arguing with Religionists, Libertarians don't seem to need to have facts. Simple ideas and rhetoric is all that you need. I've hammered on the free capitalism arguments they make. If you take it to it's end, either you have too much government or two little and we never have the right mix to show where capitalism works. We are looking for friggin Goldilocks on all issues only we can't ever find the "just right" example of Libertarianism working. I have a Facebook friend whom I like. But he has 1800 FB friends and it's a Libertarian Hive Mind on his page. He posted a question today. There were 15 answers of bullshit. One of the persons had posted three times. I post the likely answer to his question, and the circle of denial starts all over again.
If you are a Libertarian, you should ask yourself this question. Am I arguing based on historical evidence, or wish thinking? If you are an Atheist you undoubtedly are choosing to live based on reality. The following has been altered to the relevant posts, but is an example of being dishonest with one's self. Consistently, this is what I run into with Libertarians. Facts... don't need those, I have ideology! It's as much a douche move as denying science and accepting religion.
Jefferson had an intellectually cavalier attitude about bloodshed. He was quite affected by the deaths of his wife and children. Technically not bloodshed, but...he was an interesting fellow that was full of contradictions.