In my opinion, weak nerves are primary reason behind panic sell. If you cant see market in red then trading (crypto, forex, equityetc ) is not for you. Even during panic sell, there are equal no of people who are buying coins at lower price (somebody selling means somebody buying). BTC recently collapsed to 32k$ before reverting back to 50k$. There are buyers who bought BTC at 32k$, when everyone was selling in panic.