those who panic to sell bitcoin, maybe they are not mentally ready to enter the crypto world, because most of them are still weak, and are still too easy to believe in people's negative posts about bitcoin, they don't have a fixed stance, maybe from that factor they panic and immediately sell their bitcoin when the price is unstable.
Those who panic are usually newbies without a proper mindset. They usually see Bitcoin as a shortcut to success and that they expect a lot of profit from it not knowing how to deal with the volatility of the market. Bitcoin doesn't have a stable price and anything could happen anytime so panicking and holding without patience could really lead to losses.
Panic selling comes only if you're into FOMO so you're afraid maybe you will be left behind or might even lose your investments more so while you see the price is not yet in dip, you start panic selling. And for me, its the thing done mostly by newbies or those who come into the crypto market without much knowledge and preparation. You will eventually lose your money once you start selling on the price lower from what you bought.
I think if people will just hold their coins if the market is unstable, then it will not make them losers. But if they will ride with the FOMO thinking the value might go down into zero, then eventually they're just pushing themselves into a losing end.