The laughing is kind of knee-jerk (I mean, where was this laughing for the first ten weeks when Reggie Bush wasn't doing anything all that spectacular or when Vince Young was just starting to find his groove?), but it has some merit. The real problem is that you (the braintrust) passed on Vince because you thought you had a QB (in Carr) you could work with. Passing on Reggie Bush for Mario Williams, in my mind, isn't a big deal because the Texans needed help on the DL and on the OL more than they needed a running back--even if it's one of Reggie Bush's caliber. However, they certainly had justification to go in a different direction at QB and decided not to, especially given who they had waiting in the wings (heck, even if you don't go with Vince, there was Matt Leinart).
Oh well, that gives them a serious black eye. But you know, this franchise is really going to be judged by how they pick over the next couple of drafts (2007 and 2008). If they do well in those two and pick up quality FAs, then you won't really hear any laughing about the decision to pass on Young and Bush.