But do you think we have it in us? Could someone really push the button and kill all of humanity? Everyone you know? Everyone alive?
Yes. Most emphatically yes.
Could you do that?
I'd like to say no. I think the answer is no. But, honestly... Given the right motivation, the right circumstances? I dunno... I think I might just be capable of it.
Personally, I don't think anyone could. In a social situation, no one wants to be "that guy", and no one wants to be the person responsible for the destruction of our species.
That is why we have all sorts of processes and machinery and chains of command in-place to remove the human part of the equation. It's all designed to abdicate responsibility and lessen the emotional impact. So that, if need be, somebody can actually push the button.
I think even a religious extremist sociopath who wants the world to die so that he will be rewarded after death would begin to have some level of doubt when the time actually came to bring about the end.
Seriously? We've got folks here in the US who are literally waiting for the end of days. Cheering on the chaos in the Middle East because it is a sign of the end times.
I also present to you the case of Stanislav Petrov. He received satellite data suggesting that the USA had launched five nuclear missiles at the USSR, and decided to report the data as a false alarm instead of informing his superiors.
Which is, again, why we've got assorted things in-place to reduce or remove that human element from the equation.
Finally, I find support in the revelation after the end of the Cold War that the USA and USSR both never intended to make the first strike, only to retaliate.
Because, at the time, rational people were in charge. And right now I'd say that more-or-less rational people are in charge. And I don't think any rational human being is going to want to end the world. But not every human being is rational... And those who are rational, aren't rational all the time... And nuclear weapons aren't really all that hard to obtain...
All we need is for a couple religious extremists to get their hands on a nuke, and a few more religious extremists to retaliate (or even panic and strike pre-emptively) and we're well on the way to Armageddon.