There are many cases of violence in which the perpetrator does not engage in gambling activity. Violence can be relate to the upbringing from being a kid witnessing violence which the kid will grow up thinking violence can be justified if inflicted on someone who he thinks deserves it.

But for a grown-up man, it's more of a money problem that makes him irate with his surroundings. For a man who can't do something to earn, he will really be irate and would seek someone to blame. It's not always a gambling addiction but you will relate it to gambling addiction if the guy loses money and turns violent.