It's true that the influence from the culture or nature where you are living do have that weight when we talk about development of child interest, especially if the parent itself have that affiliation with gambling.
The culture or nature is the two influence for children as you rightly have said. In the case of nature, I think that can be explained with what happens around the house where the children are raised. If the father have some obnoxious character, he is suppose not to be displaying them in the front of his children because they would naturally imbibe into it. And also if there is bad teaching or learning process in the neighborhood, social gathering or school which are also agents of socialization the children are most likely going to exhibit it. Therefore, there is need to take children away from certain illicit behaviour so that they can grow like children and not to learn character above their age because they are not yet equipped mentally to handle such habit like child gambling.
I like your opinion as you elaborate the intension of my comment. That's reality, as children are still dwelling on what they are witnessing and, for them, those things that they are seeing from adults are something that they can follow, without proper support to make them understand them, those things will grow inside them, and they will simply follow it as, for them those things are normal.
We as adults/ parents should take that responsibility to make sure that those young folks will inherit good things and not those that we don't want them to grow up with.