I have not seen anyone as idiot in the investment of bitcoin,it will only be foolish if one buy at a particular price and sell below it cost price out of panic,that is when you can term such one as idiot because the price would have definitely raise above it cost price with time.
Those people who do panic selling are idiots. They bought btc at its high price, and now they're going to sell it in a very low price. What kind of mindset is that. If you can't take bitcoin's volatility, you should not invest in the first place. You should invest now in bitcoin because it's still in a low price. Don't wait for it to recover its price, or else you'll gonna regret it.