There is a limit to which friends and family can help an addict. It’s just like trying to save a drowning man; you’ve got to be careful so as to not get drowned yourself.
Someone that’s not an addict that makes a promise and fails to keep that promise over and over would have a hard time getting people to believe him anymore. Then an addict that makes a promise repeatedly and doesn’t keep it, he’ll never be believed.
Someone with an addiction is going to lose everyone that’s close to him. Everyone has issues of their own and wouldn’t want to get drawn into your bullshit anymore than they have to.
Well it is quite difficult to get rid of addiction to gambling because even in this case what you said is true where family and closest people may indeed be quite helpful when someone wants to get out of the vicious circle where addiction has been in themselves but on the other hand it is only an option to increase support because after all someone who is addicted to gambling can only stop when they have the intention to stop in themselves.
As long as there is no intention to stop, the help from family and closest people will seem useless because they do not have the intention to gamble and only like to appreciate the help of those closest to them but do not eliminate the desire to gamble.