I can easily question the flaws in attacking Iraq. But that doesn't mean that I believe that it's not the best action right now.
There's details of evolution plenty worth studying. But to question it's fundimental existence? Sure, and 2 + 2 just MIGHT equal 5 in some parallel universe.
And the theory of evolution, as it exists now, needs to be questioned. In fact, many thoughts about the theory of evolution have changed as people research and question. So why was it wrong for this professor to do so?