That is a normal reaction of a person if the market suddenly drops a lot and the price nosedives. We don't want that to be honest and we want the price of Bitcoin to be more expensive because that's the advantage of buyers who'd done that earlier. But if the price gets lower, why not? we can only react and do it or not.
If people are either new in this market or don't have knowledge, experience, and good strategies, they will lose their control in this market very easily when the market is volatile. Emotion, psychology and actions will all be affected very severely in most chaotic times in the market.
I've been there and done that, it's true. If someone is new and doesn't have enough knowledge on how to overcome it, they're going to sell almost if not everything they own in the crypto market. Emotions are high when it's about this scenario that's hard to control.
Especially if they began with not good financial management, like using all money for investment, bet that investment will bring profit consistently so that they can withdraw profit weekly or monthly to use, or most severely when they leverage from initial capital that will put them under loan expiration or worse market liquidations.
The worse situation is they're going to sell in losses, blame the market, and never go back. That's because when they have started, they lack of knowledge, they invested all that they have and yet they happen to not understand that this is what volatility is.