Do you worry that TSAs might miss an atom bomb being carried onto an airplane by a passenger?

This guy got taken off a Delta flight because the tattoos on his knuckles say “Atom Bomb”.
It is his nickname-his name is Adam. Get it?
Anyway…
Do you believe that this tattoo is actually evidence that he is dangerous?
Why the second screening? Did they really think that they might have missed the nuke the first time around?http://www.popfi.com/2010/11/17/tattooed-passenger-told-to-leave-airplane/