Something must be done so that no one can ever profit this way again. No more tribute!
I understand the sentiment, but I look at your proposed solution (which I take to be the disallowing of stock-shorting) as doing more harm to us than to those we wish to punish.
First of all, the volume of stock-shorting that occurred shortly before the WTC attack was unusually high. Tracking where those shorted-stock orders originated might well be a strong lead to find out who it was that knew about the attack before it happened. If such an unusual event should be observed again, it will almost certainly be taken as a warning this time. Thus, you are asking us to disable an early-warning system -- even presuming that the perpetrators of the next terrorist attack will have the same audacity to take traceable fiscal advantage of their assault.
Secondly, what our economy needs is investment. Not stock-trading, investment. People need to invest in stocks because they think that that investment will create additional value -- not because they think they can grab the stock low (never mind for what reason) and ride it till it's high (never mind for what reason) and then drop it like a rock.
Unfortunately, most so-called investors today have no idea that they are investing, especially not the day-traders who were a symbolic if not strong force behind the Internet bubble. Stock-shorting is a way of balancing the short-sighted optimism among "investors" who are really gamblers; if we disallow the shorting of stocks, a mechanism to reward investors for critical appraisal of a company's prospects, then we have sacrificed one of the few forces regulating our economy against bubbles.
It is not worth it.
For those concerned about the "virality" of the GPL, a suggestion: Write Your Own Damn Code.
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