[E. Pluribus Unum]

Natural selection dictates that, over time, the remaining pool of prospective homicide bombers will become dumber and dumberer.

[Blood of Tyrants]

I don't know. There are two ways to follow that. First, you really have to question the intelligence of someone who would do it in the first place. This leads one to think that the really stupid ones are the ones who step up first, the rest being too smart to do it. However, you can also argue that the ones that continue to volunteer are too stupid to learn.

It's an arggument over who is more stupid, Bevis or Butthead.