It's not stupid, it's the truth. Yes, irrationality can trigger a stampede, but that will only be a problem for those exchanges that practice fractional reserve banking. Then that is the problem, not the XRP exchange rate, and the offending exchanges will be quickly eliminated, thus solving the problem. I'm not going to hold large sums of money at an exchange, or in the form of IOUs until they have earned my trust, which may take a very long time.