There are stocks that suck, and deserve to be shorted. There are stocks that do not suck, and do not deserve to be shorted but get attacked. Here is an article on how the later scenario plays out.
http://counterfeitingstock.com/CS2.0/Co ... Stock.html
there's a lot of amazing stuff in there, but this is quite possibly the most damning piece of evidence as to how manipulative the practice can be:
Global Links Corporation is an example of how wholesale counterfeiting of shares will decimate a company's stock price. Global Links is a company that provides computer services to the real estate industry. By early 2005, their stock price had dropped to a fraction of a cent. At that point, an investor, Robert Simpson, purchased 100%+ of Global Links' 1,158,064 issued and outstanding shares. He immediately took delivery of his shares and filed the appropriate forms with the SEC, disclosing he owned all of the company's stock. His total investment was $5205. The share price was $.00434. The day after he acquired all of the company's shares, the volume on the over–the–counter market was 37 million shares. The following day saw 22 million shares change hands — all without Simpson trading a single share. It is possible that the SEC has been conducting a secret investigation, but that would be difficult without the company's involvement. It is more likely the SEC has not done anything about this fraud.
In short, a guy owned 100% of a company's shares (1,158,064 of them). Yet, in two days, 50 million shares changed hands without him selling/buying any of them. Which is a nifty trick when you consider 0 shares should have been available to sell/buy.