You are obviously saying that gambling is not trust worthy because you have always gambled for huge profits, try gambling for fun and see the difference.
One will certainly feel that gambling does more harm if from the very start they have expectations that are impossible to meet. Like winning all the time for example. You should not expect that you will win and end up being rich from gambling. Because that is just impossible. But try to change your expectations and it will be met easily.
Well, that's how it should be but many gamblers are playing to gain huge that's why they engage themselves in gambling. It's really tempting to gamble having such mindset that can possibly change a gambler's situation for good. Unfortunately that's not the case to many since majority are not lucky, otherwise casinos can't continue their business for not having revenue.
Anyway, gambling is not bad if you can gamble with self-control wherein you'll not exceed to your limit and won't have a high expectation to win.