Sometimes it is useful to listen to someone who does not understand what he is talking about.
It helps me to clarify my understanding of things, systems and interactions.
Not understanding and seeking clarification and input from people in the forum is what this is all about. That wasn't the case with this guy--he just wanted to argue. And no, it doesn't help me clarify my understanding of things at all to see someone just be antagonistic. When someone puts another person down because they don't see things their way, that really bothers me. It wasn't just this thread--it was every thread he participated in.
Anyway, he's gone and we can all go back to sharing ideas in a positive and helpful way.