I don't often watch Stefan Molyneux's youtube videos because I tend to prefer the written word to video format. However, I stumbled upon this one earlier on Wednesday afternoon and I thought it was very good. I have to agree with his criticism of Thomas Sowell; this was one of the very points that made me quit my PhD program in Edinburgh, and is one of the reasons I refuse to even think about taking another postgraduate course.
That being said, Molyneux also makes the very worthwhile point about susceptibility to error and irrationality. It can happen to anyone if we're not sufficiently careful all the time. Just like traffic accidents.