In most cases gamblers cannot control their emotions when they lose. In fact, the most important thing to control your emotions in gambling is that the player who can do it will not become the only victim in the future. We can see in many cases that there are many gamblers who do not control their emotions when they lose but they want to double the bet to make up for their lost money. But whenever they start committing such wrongdoings, they suffer more losses and become very emotional. Moreover, one must always control oneself in gambling and stop oneself when one loses money until one can control oneself, one can never be a responsible gambler. Between winning and losing gambling there must be a stop in between which can lead a gambler to a good stage in the future but if emotions are not controlled then it will surely lead to losses.
Many gamblers do not even consider the possibility of controlling themselves at all, what they want is to obtain a great deal of fun and profits from gambling, and what is ironic from that posture is that those that are looking for both of those things very often obtain neither.
Since it is impossible to obtain any fun while they are losing so much money, and despite the overwhelming evidence that their wishes are impossible to accomplish, many gamblers will not give up hope until they lose every single dollar they had to their name.