Most people who go into trading under pressure never had the opportunity to pass through mentorship because they can't pass through series of time only to rush into trading when they know they can't get anything good trading under pressure, aside the greed you clearly mentioned I think most of the traders who fall under this category are basically those who sees trading as a thing of luck just like gambling they hardly believe that knowledge has a good role in trading for anyone who wants to be successful not just in trading but most of the things that involves investing money. I don't know if there are people who started trading and making profit without following the learning process I think those who actually claim to be making money every now and then on the Internet could be the major motivators of those who trade under pressure because of the things they upload without proof.
But, heres the thing - sometimes, people do get lucky. Like, maybe someone buys a coin and it suddenly goes up, even if they didnt know much about it. That does not mean it will happen again, though. And even if some people are pretending, there are some people who have done well in trading. Its not all luck.
The real point is that learning and practicing are super important, especially with money. It's like learning to ride a bike - you wouldnt just jump on and expect to win a race, would you? You would practice and maybe get some help from someone who knows how. So, yeah....