Insider trading (assuming there is no manipulation of stock prices) really is a victimless crime.
So what do you consider the poor schmucks who buy that stock at an inflated price, not having the insider knowledge that it is about to crash and burn?
That's nonsense. Someone bought the stock she sold, possibly based on non public information. Yes, if insider trading were proved, the purchaser has recourse.
Tell that to the sucker who sold too low or bought too high because someone had a secret about a publicly held stock. It's like selling a car for it's full book value when you KNOW about a hidden problem that will make the car collapse after a few miles, or selling a house at full market value when you KNOW there is going to be a hog farm on the adjacent lot next month.
It's fraud.