I'm gonna put my two cents in:
Darwinism is a theory. As a theory it can be proven or rejected or modified as evidence comes in. All part of the scientific process. Everything is on the table and open for discussion.
Intelligent design is not a theory. It's a belief. And as a firmly held belief it's not on the table for discussion, modification or adoption of additional evidence.
You can attack someone's scientific theory and there's no hard feelings in the scientific community (usually). If you attack someone's belief, then you're in for trouble.
It seems to me, that's the core of the problem...
Very well said.