You clearly don't understand how the market operates. The short selling ban accelerated the falls during the GFC as once there were no shorters buying back their shorted stock there were simply no buyers in the market. Shorters act as a counter balance to the bulls and reduce the size of bubbles and can also act as a cushioning force during market falls. Two arrows on my chart, the top one show when the shorting ban was introduced and when shorting of non financials was allowed again ... tells the story pretty well
