The problem is even if our inept regulators catches one of these crooks in the "act" the punishment is minimal. It's usually a small fine and away you go to do more carnage to the little guys.
The fine is treated as a cost of doing business by these scumbags.
What has to happen are penalties that really hurt.Take away their ability to trade for 6 months to a year and embarrass them in the media.They can always pay the fines but that becomes difficult when you can't trade for a period of time or ever. 
That will definately get their attention!   
We need more transparency as to who is doing the Shorting.