Pharyngula: Why do physicists think they are masters of all sciences?

There seem to be a lot of physicists, however, who believe they know everything there is to know about biology (it’s a minor subdivision of physics, don’t you know), and will blithely say the most awesomely stupid things about it. Here, for instance, is Michio Kaku simply babbling in reply to a question about evolution, and getting everything wrong. It’s painful to watch.

Kaku’s tendency to bather via an orifice other than his mouth has been noted more than once in the blogohedron, and he doesn’t even need to leave the field of physics to do it. The question here is why PZ thinks that he is representative of physicists? How does he get from one to a lot of physicists?

The question is why does Michio Kaku, who happens to be a physicist, think he is a master of all science. Leave the rest of us out of it.