I think it wasn't always stupid once selling bitcoin. Why not consider some instance that the person is trader or maybe got panic. We can't judge them for all have weaknesses.
A good trader will never sell bitcoin at this time because price now a day is pretty low, people are buying more and more, we should hold It for our future because bitcoin is future making currency, I can save your future and it can give you more profit than anything else. So buy bitcoin right now but selling now is full of lose only.