Did he say the tickets that he sold to bears fans unsold tickets that cowboys fans didn't want? If that is the case, then he should have sold them to Bears fans.
If he took a block of tickets and sold them to bears fans before offering them for purchase to Cowboys fans, then I can see your point.
For Jerry the only point he is working on is getting that building filled to capacity any time he has an event there. He has bills to pay on the building and he will do it any way he sees fit. That is what any business does.
"You had better decide whether you're hangin' on the cross... or bangin' in the nails!"