when someone short sells, they must buy. they make a profit selling high and buying low. when the market reaches a point, they decide that the price is 'fair' in their view and will buy out of their short sell.
banning short selling is effectively banning these purchases. it also disallows profit to be made in a falling market.
both these things only increase the bear market. not stop it.
lol, it was tongue in cheek, I'm pretty sure MRC knows what short selling is and how it works