That is wrong though. When we are in a trade, our risk is limited to the price we fill at. In the liquid markets those fills should be pretty close to our exit orders. Yes, there are certain conditions that make filling an order very difficult, or even impossible. However, over all, or risk is supposed to be limited to the conditions of the market action. We are supposed to be protected 100% from outside market influences, specifically illegal activities of our IBs and FCMs, like theft.
If we cannot trust the institutions that we work with, then the only logical conclusion is that we cannot trade anymore. Ann Barnhardt has a seriously legitimate point. I am sure she is not the only one who has come to this conclusion.
That said, if everyone decides the integrity of the markets has collapsed, no one will trade, from Spec traders, to Hedgers. The markets will collapse, and with it will come economic Armageddon.