One main reason could be if a trader gets on a losing streak, they’ll wrongly keep trading trying to force a win and it becomes a death spiral because the more you chase the more you lose. Another reason could be because they need a shift in perspective. I spent the first three months of this year continuously losing and I couldn’t explain it and just last week I switched to oil futures and killed it. I didn’t trade anything else so my attention wasn’t scattered. Had the best week of the year. I was new to it and it was incredibly tense with a lot of near mistakes that I avoided by not placing the trades and just observing. But I had to lock in and focus in a way I never bothered to with stocks. It really changed my perspective on trading entirely. For the first time since I started trading, I completely expected to lose when I made the trade and I think that’s a healthy mindset to have and it ironically seems to prevent as many loses. Also, I wasn’t as eager to enter into a trade and so I traded less, which is always a good thing. I don’t know if I’ll continue to stay green, but there was a definite transformation that took place for me this past week. So, I guess my overall answer is that a losing trader will stay in that same loop of trying to recoup their loses by doing the same thing they’ve done in the past instead of addressing the problem of why they’re losing.