Bitcoin can not drop to zero, it is not like other altcoins that does not have value in the market. If Bitcoin is experiencing the bear market that doesn't mean the price of bitcoin will drop to zero. It is only shit coins that have the tendency to drop to zero.
let them have that thinking because it is them that will lose anyway , they will sell when there is a slight falling and will never gain because of their panicking .
I am not keeping my Eye in market when it is bearishness so i will keep safe my funds on holding , this is the secret i am doing for years now , even deleting the cookies of exchange so i will not have easy access to check the prices here and there.