Those who panic and sold there bitcoin early properly lack the understanding of bitcoin and it's characteristics, some sell when the price low thinking it may go more dip some also sell when the price is high to make little profit and hoping to buy back when the price drop i still classified these two as traders/gamblers because they lack the patient to accumulate and hodl bitcoin for long.
Fear is the end of any investment.
Proper and appropriate knowledge gets rid of fear and uncertainty, especially if we are talking about BTC..
Fear will only be the end of any investment if the investor allows the fear to get over him or her, there is no investor in this world that doesn't have an atom of fear in them and this fear is always that, nothing should go wrong in there investment till they have achieved their goal but even with this feeling they don't allow it to control them rather they control the feeling because they have a target and the reason why some people sell there Bitcoin is because of fear, whenever there is dip they will begin to feel something is going to go wrong not knowing is one of the characteristics of Bitcoin which doesn't start today.