That is why we must learn about self control because that will help us to prevents the lose becomes bigger. We must thinks that no matter what we gets from gambling, our emotion will get the effect and that can make us to keeps playing gambling without knowing when we must stop from gambling. Our tension becomes higher and we don't see a chance to limits ourselves in gambling instead just thinks to chase the wins or recover our lose.
Yes, that is ironic for them because they lose their control and also lose their money in gambling which they can not get it back. Their mistake will be bigger while they can not see what they do that makes them lose much money. Losing our emotion can cause us many bad things such as lose money, greed, addicted to gambling, stress, depress and else. So that is why we must have a strong will to control ourselves in gambling so we don't have to gets the problem and we can enjoy our gambling activity.
Yes, self-control is very important in holding back emotional feelings when we experience defeat if we cannot control ourselves then new problems will arise that we should not have. Feelings of emotion when losing are indeed natural and appear suddenly to gamblers, yes, it could be because they do not understand and are not ready to accept defeat just like that, especially if the gambler really expects a big win there, then his emotions cannot be held back easily.
It's not easy, I agree, but it should be controllable with time and experience in such situations.