1️⃣. Greed, lack of knowledge and patience. They just want "easy money". We do not intend to wait for the "market to give". Everyone wants a lot in the moment. As a rule, they are always super poor (crazy. displays of who a person is in real life).
Sure, people have greed. But, the way people manage and minimize the risk of greed taking over their decision is different for each trader. Some people would need to completely limit their trading so they wouldn't get too overconfident and only need to trade what they are capable of in the first place, but for some people that they can control the greed then it would make a greed as their motivation to gain more but of course with limitation as well. Once you have set your limit, then I think you are already in a good spot.
Most of people human's nature are basically the same but each person has different trait that makes it unique to handle some circumstances.