The HODL movement is very contagious. But if it weren't so, it would have been much harder to sell the top. You can relatively easily sell on the high(or back to normal) if you are not delusional which i have been a bit and found about it too late.
Yes well that is the thing. "Pro traders" are under the delusion that their coins will just go up and up and up, and nothing else can happen. Their head is that infested with shit, even when they see their coins being wiped out, the just "HODL" because they read it on Facebook and are now part of the HODL LAMBOS MOON POSSE.
In reality they are just fucking jokes who have no clue in the slightest about trading. However their delusional state of mind tells them the opposite. They truly believe they are gifted expert traders.