the weak do not want to think well. sometimes it makes them so desperate because prices slow down and eventually panic happens. The point is to be patient and be sure that bitcoin will skyrocket on time.
Sometimes you don't wanna hold if you know the actual value of a particular coin or token. It is quite prudent to sell when prices rise and buy back more of the said coin or token and continue the process in this fashion. Hodling needs too much patience which most people may not have.