It is not a matter of re-assuring ourselves about whom is the biggest threat, but rather it is about acknowledging & accepting the fact.i am surprised that more people are answering that it is us that is the major threat. i put that option there cause i knew that if i didnt then i would have heard about it either way.
what i am saying is that in our society we have to reassure ourselves all the time that we humans are the biggest threat to ourselves. its like its a lil drug that we are addicted to.
If aliens were to land in the middle of the White House Rose Garden, I'd be less concerned about them then I would be of the human who decides that the only way to save humanity would be by destroying it.
PS: Nice avatar.