Sell coins too fast because they want to cut losses. And indeed we will experience losses but the results of selling coins can buy more promising coins. Or they also have urgent life needs.
there are some reasons of it. and yours is one of them. I agree. if we are experienced in the first market is going to fall, it may trigger us to sell because we were in a panic situation. however, some of us might still hold since we guess that it will rise again, but the reality is not like our thought. if we are in this situation, we are stuck what we are gonna do. selling is impossible but holding is the one of the way.