I agree, but, as I said, getting aggressive because of losses is a different story. There are so called "problem gamblers", and they can get aggressive without drinking alcohol(I personally know one, he doesn't drink at all). But alcohol can turn an otherwise normal person into a problem gambler. That's why alcohol and drugs should be avoided while gambling.
Alcohol can have a negative effect on even conscious people if they drink alcohol without playing gambling will lose their consciousness and often mess around them because it is out of control, especially if playing gambling certainly greatly affects their mentality and tends to be troublesome in their own gambling games.
If we think positively of course in gambling it will be fine even can control their finances while gambling and will know how much he has to bet in that situation.
We know that alcohol has a negative effect, whether we play gambling or not. We can lose control when we drink alcohol, and if we play gambling, that can make us get serious trouble, which is we can lose the money. I already saw a person who is drinking alcohol, and that makes him say anything even shout to other people. I cannot imagine if that person drinks alcohol, and he plays gambling at the same time. Maybe he will make other people become angry with him and want to kick him.