While reading this post from Eric Meyer's blog, I found this little jewel:
Never ascribe to malice that which can be more easily explained by stupidity.
I'm going to name this assertion the Rumsfeld's razor™. Not that Donald Rumsfeld did ever say something like this (could he?), but by using Ockham's razor to determine if Rumsfeld is malicious or stupid, one can easily come to this very conclusion.