Consider the Terrorist
It turns out that terrorists may be nitwits. Sample these:
… it’s fair to say that the Taliban employ the world’s worst suicide bombers [in Afghanistan]: one in two manages to kill only himself. And this success rate hasn’t improved at all in the five years they’ve been using suicide bombers, despite the experience of hundreds of attacks—or attempted attacks. In Afghanistan, as in many cultures, a manly embrace is a time-honored tradition for warriors before they go off to face death. Thus, many suicide bombers never even make it out of their training camp or safe house, as the pressure from these group hugs triggers the explosives in suicide vests. [The Atlantic]
Of course, a bullet fired from a nitwit’s gun would be just as deadly as one from (say) Sheldon Cooper’s gun.