Comfort zones and prejudices motivate people, not just with VCs in Silicon Valley

I read a well articulated blog posting by Hank Williams, in which he was arguing that comfort rather than racism may be motivating some of the industry movers in Silicon Valley. I think such observation is more general than he may have put it. I would argue that the senses of comfort (or discomfort) motivates most of the decisions people routinely make, and this all around the world.