Instapundit gone nuts?

I've looked over Instapundit, and used to like his posts. I considered him a reasonable spokesman for the Right, and liked to check his website to see the rights view of things, with the polemics left out. However, I see that lately he has really picked up the "If Kerry criticizes Bush then Kerry is a traitor" line of thought. Good grief. I'd have thought a law professor would have more tolerance for differing thought.

I mean, using a reduction ad absurdum argument, would it be traitorous to criticize Hitler? At what point does it become legitimate criticism. How bad does the despot have to be to be criticized?