For me I think they do it because they dont know what thale exact strategy for buying amd selling crypto coins.For me when coins increase simply sell but when it decrease just buy.
it's an effect of the crowd - many people follow the decision of the crowd and sell in panic at low price. the same situation and with buying assets.
To be shorten, they do not use their head to analyze the situation, they used their panic feeling that absolutely cause a wrong decision.