It's their personal way of thinking to exit on their trades. As you can see, whenever their is a market's dump, their is a panic sellers and panic buyers. Short term traders just want to secure their fund by cashing out. We can't blame them. Greedy or not, the first thing a trader think is the profits that they will gained once the market is on their way or not. Let us not be affected with those if we have a major goal in trading.
Each trader have their own strategy, having their own targets and also have a level of risk that they must choose before starting a trade under any market conditions. So, it will be their liberties when being a panic seller or a clear panic buyer their goal is profit, I agree with you. Yeah, it is indeed a necessity when we are in a market to understand every decision was chosen by every trader, no need to believe what they do and only focus on the target we want and stay focused on the strategy that we made.