In a hypothetical situation, if satoshi ever comes back, does he has the power to kill crypotcurrency?

What can he do to make bitcoin valueless? What if he comes back and spread some ugly news about bitcoin? What if he comes back and sell all his bitcoins away? What if he comes back and say xxxcoin is the way to go? What is going to happen to bitcoin?

If satoshi is nsa or some scamming group, can he/they potentially use this power to control or destroy the whole world once bitcoin is accepted into the mainstream? If thats the case, all the mining gears, stock exchanges and all industry that builds around bitcoin will disappear in a day.

What if satoshi is a sadist or has emotional problems? are we all too naive to follow the tail of an anonymous person?

will that day every come?