Earlier quoted context omitted.
There was a case study of short selling on NPR's Planet Money a few weeks ago: http://www.npr.org/2015/01/30/382587945/winning-at-short-sel... Basically, the guy discovered a Chinese test prep company (think College Board) that had recently started to be listed on American stock exchanges, and discovered that their payment system returned an error. He emailed their support address, and it bounced. He hired a guy on C…
> He shorted the ever living crap out of the stock, broke the news, and won big. Wait, I thought shorting meant he effectively sold shares to some other, unfortunate, investor. It sounds like he participated in a pump and dump scheme/scam.
Also, why does it matter that he shorted the stock? What if he had previously purchased it off of a hot tip then, upon further due diligence, had decided the company wasn't as valuable as he had previously thought? There still has to be a counterparty to that trade.
At the end of the day, this guy probably saved more investors from being taken by this scam because he exposed it early. Without the incentive to make money, he would not have hired someone to investigate their offices in China. Without that investigation, he would not have shorted the stock, sending the market a clear signal that the stock was over-priced, and written up his research. Without his signaling and research, more people would have bought the stock, creating a bigger scam, and destroying more wealth.