Does bitcointalk run some kind of casino? Does it engage in the business of betting? If not then your cited Interstate Wire Act does not show that the forum is breaking the law.

Wasn't pirate40 running a ponzi scheme on the forum? I know that there were threads about his ponzi on here. If you are saying that by not taking down scams the forum knows about they are breaking the law, and it should have been obvious that he was running a ponzi that would eventually collapse (e.g. a scam).