a fair explanation for what happened
I work at a Southern Indiana casino, of which Aztar (the very one in question) is one. I understand from the news reports that the plaintiff in this case was a slots player, and not a table games player. Since this is the case, he could play with anonymity. In fact, his card could be inserted into a machine by anyone to get the rating points. It's common practice on table games to allow two players to put their buy-ins on the same player card, thus increasing comps under one name. This should be reason enough that Aztar would not be responsible for looking for the guy just because they know his card is being used.
Someone is certainly thinking "well why does he still have a player card anyway?" Well, if you'd blown thousands of dollars at the casino, it's pretty likely that by the time you quit gambling, you've still got a few comps left on there you could use. Restaurants, hotel rooms, I'm sure this guy had plenty to blow that he'd "earned" by wasting his money. Deactivating his card would have wiped out his account, and I don't think he'd have been a real happy camper then. Aztar offers 3 different 'self-exclusion' programs, too (it's on a sign in their stairwells) -- 1 year, 5 years, or forever. If this guy wasn't set up for the forever plan (which apparently he wasn't since he would have been allowed to come back after showing some papers saying he was OK) he would want to keep the same account since it shows him as a high roller there. If he had to start from scratch and was suddenly only wasting 10% of what he used to, he'd be a nobody there and probably wouldn't even have a good time.
But regardless, I think he's a chump that needs to own up to his own responsibilities. If he had been turned away from Aztar as he NOW says they should have done, I'm sure he'd have driven two hours to go to another casino instead.