People that say stupid things should be called out, their achievements are relevant to that. Not doing so creates cults of personality where brilliant people are able to basically say whatever they like.
Concern for human overpopulation is not new: http://en.wikipedia.org/wiki/Overpop...ory_of_concern
Perhaps he wasn't concerned when he had kids, I'd buy that. Nonetheless, there's an incongruity here - population growth is almost zero in first world nations already, so he's largely preaching to the choir there. Going to underdeveloped countries and advocating against their cultural norms while arguing from a huge place of privilege just seems obnoxious and entitled.