Selling your bitcoin at the right price and still you can gain profit is not a stupid decision. Acquiring your btc at a higher price and you plan to sell this time where price is still low, that is where I can say a stupid decision. The best thing to do for now is just to hold your bitcoin even if it take a longer period of time to recover then do it. This is the only option for now to avoid bigger loss from your investment.
Yes if a person buy bitcoin at a price and then he sell them on a price which is lower than his buy price then it is not good and will be considered as a stupid action by many of us. The price of bitcoin increases to its higher price in life and that is not rejected by any of the user of bitcoin then if you do not need money for your use then do not sell them and wait for the better time to sell.