Prophesying about doomsday is a serious and regular business. Various prophets of doom have forecast the end of the world many times, but it doesn’t matter to them that the past prophecies have turned out to be hoaxes. And yet, there are people who predict the end of the world and followers who believe them.
I am not saying that nothing can destroy life on earth. All I am saying is that there is no reliable way of predicting if and when this will happen.
Similarly, there are economists and stock market predictors who keep forecasting recessions and bear markets. But unlike doomsday, we actually see recessions and market crashes. This does not mean they are any good; it just means that if you keep predicting recessions or bear markets, sooner or later you will turn out to be right.