Sometimes many people try to manipulate the market and buy precious tokens cheap and selling high later.They intentionally cause fear and panic in the inexperienced members and take advantage to perpetrate their greed activities.
That is a part of investing and trading. All you have to do is learn how to join or do the same the way they do it for you to bring your own fortune for yourself.
I see this situation as a normal thing in the market, everyone of us wants to buy a cheaper coins and sold it with huge profit and maybe those are the professional traders who knows when to enter the market. Greed is not bad sometimes, but as individual you must control it well. Let's join the trend instead of fighting with in, the only way to win is to ride with it.
Greedy person that wants to buy in a cheap price and sold it when the market going rise it would be causes of market decrease. You need to know on how to be a professional trader let the other people that don't know on how's the market movement and they will have experience on what will happen, in that way they will learn from it.