Let them do what they want OP, these people that are blaming themselves aren't going to stop anytime soon just because they're constantly reminded that it doesn't do anything to the game and that blaming leads to nothing, I think that it's best to let them do their thing. This kind of people will almost always come to their senses on their own and they'll stop eventually, if we don't want to be like this, the easiest solution would be to stop gambling, that's the easiest I think. Think of this as someone who believes in luck, there are some things that they can just explain so they leave the explanation as fate or luck, much easier that way, it's the same with these people blaming the game, they want some outlet for their frustrations.
You are correct with your submission. If you are reckless with gambling then you will have to keep complaining about losses. You can't gamble rightly with minimal bankroll and you keep complaining about the bad omen. A gambler with minimal stake has better control of his game more than that gambler that throws in all he has at once going for the winning without considering that he would be losing all of the money if he didn't win.
It is better to have some gambling limit so that when you are not getting it right then you can easily withdraw yourself and wait for the next time game to try hitting back, continuous trying to win is a ticket to addiction because you are losing your control.
Having your own rules or having limits before deciding to carry out gambling activities is very necessary and must be done by a gambler because only in this way can a gambler have self-control not to chase wins or losses too much because we are used to these limits so we won't may violate this limit.
Indeed, having limits like this is not easy to do, but as long as a gambler has a strong desire to bet safely, he will certainly easily learn little by little to obey the rules that have been made.
Yes, indeed, a gambler who always bets with the smallest amount can always have strong control and never experience deep disappointment because the money he has lost has been planned and will not feel like he has lost because the budget used is money he can afford to lose.
In the past, at first I wasn't used to limits like this, but as long as I tried consistently not to make the same mistakes, I managed to have good control, even when I bet on Black Jack when I lost once, I chose to wait until the right time to bet again so that not too emotional and enjoy the bet more.