People like it do it and that is pretty normal. But they should know that the money that they lost is already wasted money and that is not good.
They must play with some small amounts and that is the only good thing that they can do. Or just not gamble.
Taking gambling as a fun will be good solution to make gambling not so addicting.
Even many gamblers are going for gambling just for fun. But when you keep on repeating same mistakes it becomes a habit and in over time it becomes an addiction. So, gambling by nature becoming addiction for whatever reasons you are playing with it.