Former SEC chairman Harvey Pitt on CNBC last night:
“there’s a very simple solution…if you want to sell a stock short, you have to have a legally enforceable rule to produce that stock on settlement day. That’s all it takes.”

“naked short selling is what’s causing a lot of the problems in the market.”

"That's been the real problem...people in effect are just gambling, they're assuming the stock price will go down. They then spread false rumors to help the stock price go down. But they have no skin in the game because they haven't committed to produce the shares they purportedly are selling."
h/t: DeepCapture