The shell that was found was not made by a wacko in his garage. It's a manufactured type which Saddam is known to had had, claimed to have destroyed and has now been found again. It's not as deadly as a nuke, but deadlier than a dirty bomb.
Sorry, I am just not impressed by Sarin. Again, it can be made in anyones garage with off the shelf chemicals. With two clicks of the mouse, you can find the ingredients. Even the small wacko group in Japan stated they found it easy to obtain and use. That is why I am not impressed.