Selling bitcoin is not a stupid decision. Before you invest in cryptocurrency, you should have read and understood how it works, the market goes up and down. Up you sale and down you buy. You don't expect it to rise so high afterwards, because must time it is otherwise after buying.
Selling Bitcoin when it goes down or up does not have to be a stupid choice. If the sale was based on panic then that's what I think is an improper choice. Not stupidity. Imagine if we buy the current price $ 6500 later tomorrow morning $ 7000 and we panicked and sold it tomorrow morning because of panic to see the profit, I think this decision is less precise and rash. An analysis is needed there before making a decision.