Sometimes panic selling can save us too. 
I am not a regular trader but I feels panic selling at the beginning of bear run can save lot of capital than waiting for too long for doing trades.
My addition is don't regret about panic selling if the prices didn't fall after you sold your crypto just move on and reinvest on the right coin.
I agree that panic selling could save us also. The market is pretty much a volatile one. We don't know the next move of each trend. What if a person panic sell and after that move he did, the market fell down? He's safe from that fall and at least we can say he save profit. I am not a regular trader but I feels panic selling at the beginning of bear run can save lot of capital than waiting for too long for doing trades.
My addition is don't regret about panic selling if the prices didn't fall after you sold your crypto just move on and reinvest on the right coin.