It is the psychology but more importantly it is the emotions that get the best of us. This happens in every facet of life and trading is no different. When we lose we want to get out to stop the pain and when we win we want to book our profits. You must get a better mental state if wanting to achieve big things at trading cryptos imo!
I wonder if that means psychopaths are better at trading? If one didn't have the full emotional range, would that make them better at keeping emotion out of trades? I guess they may have higher tolerance to risk, too, which could work in their favour or against them...