Apple, FB, Google, Amazon, and Netflix together represent about 8.3% of global stock market capitalization. So obliterating them all in one day would not rise

Apple, FB, Google, Amazon, and Netflix together represent about 8.3% of global stock market capitalization. So obliterating them all in one day would not rise to the level of a "correction" (that's 10%) much less a "bear market" (that's 20%). Probably no more than about the 9th largest one-day market drop, either. Conversely, the market has gained well over 8% in a day over a dozen times in recorded history.