Smart people can usually find ways to defend their beliefs. You would think that smart people would have a more rational aproach than someone who is not smart. But sometimes really intelligent people are raised by people who teach them things that don't make sence. As time goes on, they become more and more attached to these ideas and beliefs, making it hard for them to let go of them. In order to not deal with the pain that might come with losing faith or realizing they are wrong, they figure out ways to make it seem logical and rational.

I didn't watch the video, but I did read something about this once. It's interesting stuff.

You don't need intelligence to be a dumbass...

Ooow, this one is great but his other lectures are far more in depth, and I highly recomend his book "the believing brain" one of my favourite reads.