Of course self-control is good when a person does not run in a panic to sell everything . But it is good only for the person, but not for the market. Therefore, we can observe market fluctuations .
Yes i don't have reasons to be panic and selling when the market price goes down due to it will rise up again if i have extra money, present is good time to buy more alternative coins to be held for couples months laters and the fluctuation in the price of cryptocurrencies is good for us, it is not something scarry just chance to us for getting more alternative coins in cheap.