Well, to begin with, many people do complain about those types of games. cough Jack Thompson cough. There is infact, a great deal of yelling going on about those. It's not hypocritical for the humane society to talk about this game versus Call of Duty. Their job is to deal with animals and animal cruelty. As an organization, they have no 'position' on violence on humans per se. And Michael Vick is involved for all the obvious reasons... he has to look like he's sorry for what he'd done.

Furthermore, there is a difference between violence on humans and violence on animals. Regardless of the how violent our entertainment gets, there is also a constant reminder from society/whatever that it's not cool/moral/right whatever to actually maim/kill other people. On the other hand, there is much less of that when talking about animal violence.

Anyhow, I still think it's kinda silly. No actual reason for it to be pulled. I really think that everyone is just going through the motions here.