For the life of me, I still don't see how shorting benefits the market, much less, NSS.
The market is perfectly capable of correcting itself in the event a company's stock becomes overvalued. That's what supply and demand is all about. To throw in the 'curve ball' of shorting only serves to bolster the bearish nature of a minority, but to such an extent that it can overwhelm the bullish nature of the majority.
NSS is simply a license to further compound upon bearishness, and gives rise to the suspicion of who the SEC really works for. (SEC 'claims' NSS doesn't exist, just like Mob bosses who deny there's anything called the Mafia.)
IMO, ALL shorting should be criminalized.
Plain....and simple.