More relating to Shermer's arguments:-https://scientiasalon.wordpress.com/2015/02/23/michael-shermer-and-the-moral-arc-of-libertarianism/-I thought this article by Pigliucci was well written, and makes some telling points especially about the historical background. I still think Harris and Shermer are right about their "realist" ethics, but there is always a danger of selection bias in trying to find support for an argument.