I don’t think anyone is assuming they were doing it on purpose. I think this is an issue of hypocrisy. The law says it’s illegal to play with marked cards, and the casino was dealing marked cards, but somehow they are trying to blame the player. At a casino the player isn’t even allowed to handle the cards, and can’t be held responsible for them being marked. If the law was violated, it was the casino that did the violating.
Though if you wanted to argue in an extreme Machiavellian way, the casino could be using marked cards knowing that if they ever lost big they could claim the player cheated. I don’t think that’s what was going on, but the casino should have the responsibility to make sure the cards are not marked.
