Lots of theories out there. Here are just a few:
Osama bin Laden isn't really dead. He declared death to United States 20 years ago, and he's making 9/11 look like child's play.
The Democrats are trying like hell to get Trump out of power, because they know they can't win the election in November.
Overcrowded China wanted to reduce their population, but the virus got out of control by accident, and spread to other countries.
Rich billionaires wanted to bring the economy down so they could buy up more stocks and funds at cheap prices, then bring prices to record levels again.
Governments wanted to reduce health care workers by death instead of layoff, because they can't afford their paychecks.
Environmentalists wanted to bring economy down and reduce emissions to slow down global warming.
OPEC wanted to bring oil prices down by raising supply, in order to bankrupt non OPEC countries.
The unemployment rate was at historic lows, so the economists wanted to keep the interest rates low, by bringing unemployment levels back up to traditional levels.