A curriculum that includes ID is a curriculum that will encourage sophisticated thinking--I would appreciate it if somebody would make the attempt to explain how it could be detrimental.
I expect critical thinking, and I will not gloat when I win the argument.
I would argue that there's nothing sophisticated about charlatan pseudo science. But, to get to your point, other than dishonest deception that seems to be synonymous with the ID crowd, I don't see anything wrong an elective class in ID. That's not the issue of the debate. The issue is that dishonest people with a dubious agenda are trying to sneak this charlatan pseudoscience into science class thus depriving prospective career scientists of their education and that is very detrimental.