Some ppl gambled for fun that's how their addiction started. If they're gambling with the correct mind it isn't going to become a problem but if their mind gets addicted to gamble it's going to change their life for ever. When you gamble you're going to lose money the companies don't.
There isn't a best way to gamble ppl must know it. You can't get advice or buy books telling you the best way to gamble so don't believe people who give you advice. If you're gambling becomes addiction you're risking your money & health so don't gamble. If you try investing or saving you'll find it's better.
I don't think all type of people should be forced to give up gambling completely, if someone gambles just for fun, then what's stopping them? They're not addicted to it, so what's the problem? If someone gambles for fun with the right mindset, then they can definitely gamble, gambling is not just for those who want to achieve success through gambling, they should stay away from gambling, but if you just want to gamble for fun, then you can definitely do it.