Absolutely not! This is how people react when they panic. I am the type of person who don't panic because I have prepared myself for this kind of scenario from the very start. It's all psychological, mental, and emotional mixed all together! If we are unable to control even one, there's a possibility that we will make some unnecessary decisions. And I do not like making such decisions. As for the market and token prices going down, they will eventually recover in time.
I've been faced with this many many times and I'm still being "tested" with my patience when the price is going to crash and you have nothing to do rather than buying more (riskier) or selling (riskier too)
Sometimes if you see that the coin you hold has no future and the exchanges are delisting it then you should sell and then check if the price increases if yes then its maybe good to buy.