panic selling usually occurs when prices are high bitcoin, suddenly dropped drastically, or when there are rumors saying that bitcoin prices will drop in the near future. if people hear it, usually there will be panic selling, and the resulting price of bitcoin down fast, but I think it is a natural thing
You are partly right on that. You know what's even a bigger driver for fear that results in people panic selling?
It's the fact that people are investing money into Bitcoin that they can't afford to invest, as it is money for food, to pay bills, and the list goes on.
These people are gambling with money they so badly need in their personal lives, and thus are bringing themselves and possibly their family in great danger.
Every bit of fud and even the slightest possibility of the price going down will be a reason to sell their coins in panic. All to prevent potential bigger losses.