I think part of the reason people don't like to talk about weapons of mass destruction is because of the nightmare scenarios that inevitably proceed from those discussions. Just when you thought the subject was off the radar screen, Dead Serious presents a troubling analysis of what could occur and why we should not take Iraq's WMD lightly.
I've written on this topic before and even argued that the Senate Intelligence Committee Report got it wrong when they concluded that there were no WMD in Iraq. (Dead Serious makes a good argument that the real WMD are the scientists who can create them and not the stockpiles that we have searched for to no avail.)
All I can say is this is one subject I'd rather err on the side of caution on. To dismiss them as a "mistake" of all the major intelligence agencies in the world (which is implausible to put it kindly) is to risk taking them lightly, which would end up making the release of them much worse than they otherwise would have been.
But enough about that. No one wants to have those kinds of nightmares.