When they lose money by gambling, they have a very good mentality, they behave well towards their family. And when they lose money through gambling, they cannot control their mind, they lose their temper in a short time, so their behavior in the family is very bad. But gambling doesn't save much money most of the time maybe gambling with this mindset they will win a lot of money it is seen that gambling they are losing time after time thus damaging their cash by gambling harming their family So it is best to avoid gambling.
If that gambler can managing his emotions towards his family, he will not doing something bad for his family even if he gets losses by playing gambling. His emotions will not gets impact because of his losses because he will thinks that losing in gambling games is a certain and he knows that he doesn't have to playing gambling too hard. By doing that, he will not have to feel emotions if he losses and when he comes back to his home, he can manage his emotions properly and not getting impact from his losses. It needs a good self-control for not getting impact from whatever he gets from gambling so he can be okay whether he wins or losses. He knows how to treats gambling properly because he knows gambling is just for having fun.
That means the key is always about "managing and controlling" isn't it? Well that's obvious, in any case and not just about gambling, everyone has emotions and it's normal for them to occur due to something that's not what you expected, but if it happens excessively then obviously it's not good and will actually cause a lot of new problems, and also on the other hand we have to understand where we are, or we mean we have to understand that this is gambling which is always about winning and losing.
So it's ridiculous behavior if you're overly emotional about losing, and I would probably say that you're not a responsible gambler. And the point is like you said that the only way if they don't want to experience dominating emotions is that they should gamble moderately and reasonably in the sense of only putting an amount that will not make them angry if the money is lost in the end, and I believe that treating gambling with some of the suggested actions will be easier to do when you make gambling as a suggestion of entertainment, because then I am sure that you will not think of doing excessive actions and also I am sure that you will not be too dominated by emotions when the results do not match.