Hiney is WAY too much of a Wrestling fan by worrying about this. It would sorta be the same as a local fair paying a High School pitching phenom to throw baseballs at the milk bottles to show that knocking them all down really can be done.
I have no idea where animal rights groups get off by trying to ban this type of activity. Just like Lance says, these bears are simply playing with the people they "wrestle." I've been to these events and they are pretty entertaining. I watched my cousin, who was a pretty good wrestler and a nasty linebacker at all of 145 lbs. wrestle the bear at one of these, the bear simply didn't want to get pinned that night however.