It's actually very simple -- if things don't work, they don't work. I think that's reason enough, isn't it? It's pointless to force yourself to do something that isn't possible to achieve. In case of trading, most people are just blindly buying at whatever price in the hope that they get lucky. It will work out once, maybe twice, but at some point you'll see that without proper market understanding it's better to not do anything -- it's called self protection. Certain people just aren't made for trading
Yeah, to do the same thing all over again and expect a different result is bordering on insanity
The problem is that most people learn it only the hard way, namely, when they got heavily kicked in the ass (e.g. via losing their capital in a shit coin investment). In fact, some people can't learn anything at all fundamentally, and they stubbornly keep making basically the same mistakes time after time (many scam victims are like that). So calling it a day and quitting may not in fact be the worst decision, after all
For me it's a kind of a dilemma: missing opportunities or preventing further losses. Sometimes I lose a lot at the start of my day which awfully sucks and I am near my stop-loss threshold however, I am also that kind of person who will think that the day is young to quit early and so I would do another round or just stop. But being responsible is the best way to go rather than being optimistic. Self-control is hard to achievein trading, but if you master that, you might end up being a winner after all.