The thing that continues to keep me safe from doing stupid things in gambling, are the stories of others who have did stupid things and the consequences of it.
The consequences being that they lost not just material possessions but their mental health was in shambles. Anything that can mess with your mental health, messes with your physical health too.
Betting responsibly is more fun than betting "stupidly".
I agree with your opinion, so it's true that other people's stupidity is a benchmark against imitating such things. However, sometimes someone addicted to gambling doesn't realize they're addicted and assumes they're gambling responsibly, but in reality, it's not.
Always set limits for yourself and be able to manage risk to avoid foolish things that can harm you.