The present administration has gone to great lengths to prop the stock market up through any means necessary because the President makes no distinction between the market and the economy as a whole.

The present condition of the market is entirely artificial, and unrepresentative of the actual state of the economy. Thus, whenever the stock market is allowed to return to its natural level, it's going to take a bearish turn to surpass all others.

Even a government can't manipulate the market forever.