Because all there focuses are on gambling, when you come across this kind of people. "all you need is to counsel them" because it's beneficial
If you are not someone who is close enough to a gambling addict, your advice will only be ignored. You should know that gambling addiction, which has already had quite severe effects, will not be easily eliminated just through advice. You may actually be considered someone who does not support them and will be avoided.
If they live in an environment that is also mostly made up of gambling addicts, then it will be difficult to make them aware. The influence of the environment is very important in forming a new, better awareness.