I understand that they may think they did nothing wrong, because it is not as clear as pointing a gun at someone, but they need to read the rules a lot more clearly before they gamble, so that they would know if they did something wrong or not. I have seen people who had multiple accounts who got banned and honestly didn't know that was wrong, that's funny to me because I read all the rules any casino I play in presents to make sure I never break any of them.
If you haven't noticed the rule of any casino and you break it by mistake or unintentionally also you can't blame them for it but sometimes there are some players who can't afford their loss while wagering and turn to accuse casino for it but it won't help them.