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.
Well, every addiction for itself can be dangerous and if person combines it several that can be a disaster.
Selfcontrol is very important, if not the crucial, but not all people have strong personalities and they need help.
Just to think positive of gambling is not enough, you need to be aware where too much of too passionate gambling can lead you.