No doubt that availability of jobs will get many youths out of the street and that will reduce their exposure to vices as they say that an idle mind becomes the devils workshop, just meaning when you don't have meaningful things or positive things to do then you are likely to get into wrong things. So job creation will shift the focus of some youths away from gambling because many don't profit from it and when they see an alternative in jobs, they are likely going to throw in the towel on gambling and face their jobs.

However, the picture you painted in the body of your post that the effect of gambling is the reason of anger and maltreating of the siblings, this I doubt. That boy may have that gen from the parents especially from the father. He has anger spirit and nature of being wicked, except gambling failure only amplified it. Otherwise, every gambler who loses money should beat their wife's up, their mother or girl friends.