I believe that even if a person has a genetic predisposition to gambling, it is not a particular problem because a person can control his actions and refrain from negative experiences.
In my opinion we choose our own destiny and what to do in life. If a gambler blames his losses on his genes, most likely he is afraid to admit his mistakes and tries to blame someone else for his mistakes.
Make sense, but IMO it's not really on the genes. It is when a child witnesses how their parents gambles regularly like it's a normal thing for them that is a part of their daily grind. It will instill in their young minds and will eventually develop into a habit and worse gambling addiction.
So, yeah it is us who chooses our fate on whether or not we engage into gambling excessively.
I also have the same stand on this, it is a matter of how we learn gambling from our elders , in this we inherit the gambling by them teaching us how to gamble and not in the bloodline ,
this is not something we can inherit in terms of passing thru generation without our consent .
so maybe it happens because of the elders not concern if we will be a gambler also like them or not , so lets use this as lesson for our youngsters not to become in our kind.