Morgan, I'll agree with you that one of us is exhibiting "arrogant disdain" and "contempt and hatred" and "needs to learn how to get along with others". All my intra-party activism is aimed at ideological tolerance and ecumenicism in our movement, so you're misinformed when you suggest I "insist on ideological purity". You apparently have no idea who I am and what I've been doing within the LP, and so every sentence of your screed against me drips with irony.
If you ever get beyond your vicious "pogrom" and "concentration camp" rhetoric to muster any substantive response to my defense of my ACLU analysis, I'll be waiting. Meanwhile, try not to confuse disagreement with personal attack.
As for the limits of knowledge, well, I've actually written a book with that as its subtitle: Human Knowledge - Foundations and Limits. I'll bet you it contains more about the uncertainty of our knowledge than Friedman has ever written on the subject.