Losing money is always unpleasant, but I completely agree with you that a responsible gambler should consider and accept the possibility of defeat before the start of the gambling session, rather than foaming at the mouth and proving that the casino is to blame for his loss. I have seen such people many times, and I was really amazed at how deeply convinced they were that they were not to blame for losing all their money. I would not recommend such people to gamble at all, because it is partly because of such people that society has a not very good opinion of gambling.