The first chart is a famous one from Bitcoin about "how bubbles look like". The 2nd one is from the stock market, suggesting that it will drop hard as the left one.
Because past prices predict futures ones. Because at a P/E of 14, the market is presently on a huge bubble. Because corporations didn't grow and made profits - including the ones with no debt, so current prices are artificially inflated.
It has to come down, right?