Well, I think they're really mocking Kerry, not wounded vets in general.
Despite the fact that it's tongue-in-cheek Kerry-bashing (which one is to expect at a rival convention), it's certainly over-the-top and could be construed as offensive to vets. I wish they wouldn't do it, but then again, delegates do what they want.
I agree with you by and large on this one. Bad taste.
ZAP