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Keep in mind there are two types of players when playing gambling. First, those who play with the aim as entertainment just to let go of tired after work, they play naturally and even when getting defeat is not a problem. And secondly, those who play with the aim of winning, they do anything to achieve victory including spending large capital so it is not surprising if they are disappointed or regret when at the end of the game has not yet won.
And should when they have experienced disappointment and regret makes them stop to play gambling, but what happens is the opposite they are increasingly rising to continue to play.
If there are two types of gamblers as you mentioned in this post. we can compare it, that the second type of gambler is more than the first type. yep, as we know and realize, that gambling carries risks. we are well aware, the money we bet has the potential to be lost. that means, we lose during the gambling session.
For the first type of gambler, they usually only do it in their spare time. one example, as you said. they play naturally, even when they lose it's not a problem. it's just that sometimes conditions and situations can influence the psychology of the first type of gambler to make mistakes. for example, he gambled when his emotional level was unstable and in the end he was carried away to spend his time in gambling. if lucky they will get the win, and if vice versa, they will regret that they have spent a lot of money at the gambling table.
The second type of gambler, as you describe in this post. their goal of gambling is none other than to get a win. this type, doesn't really care about enjoying his gambling session. which in the end, without good control, they have spent a lot of money. in the end, regret after suffering a big defeat. moreover, the money at stake is obtained from loan funds.
Overall, we agree with what you're saying. but from the side of human psychology, it would be very natural if someone who gambled would regret it afterwards, whatever the reason. it doesn't even rule out the possibility, the first type of gambler also often experiences things like that. So, I think this is something that most of us naturally experience.