Actually bitcoin is like others coin so its price can be high and low. So if people see that the price of bitcoin is high so they can sell. They can save something for the future also. There is nothing as stupid decision.
Bitcoin's love is not stupid desission we know that bitcoin is rising when we do not know it's down sometimes we are surprised but when you turn bitcoin on and it's the future it goes up like a lotto on the lotto and you can say to yourself that's your decision right and it's not stupid that you have a bitcoin.