If, in 2014, President Obama had tweeted something like "I've had it with Kim! Sending the missiles now!" no one would've believed it, as it would've been quite

If, in 2014, President Obama had tweeted something like "I've had it with Kim! Sending the missiles now!" no one would've believed it, as it would've been quite out-of-character and also he didn't go around announcing policies, executive orders and other business using Twitter. With Trump though, it gets more complicated. He has antagonized and name-called the leader of NK on Twitter. He has announced policies on Twitter that even his cabinet weren't aware of beforehand. If he posted the above tweet (sub out "Kim" for "Little Rocket man") and you were Kim Jong-un, what would you do? Sure, he's never announced a military attack on Twitter before (I think... although I'm not 100% sure) but given the other things he's done and his general nature, could you be 100% sure it's fake? And if it's not fake, then the rational thing would be to counterattack with whatever capability you have without waiting for confirmation from someone else. And then, if you're one of the US Joint Chiefs: You see the tweet, you know that it's false, but you consider it from Kim's perspective (see the last paragraph) and have to game out the chance that Kim will see this as a credible attack and launch his rockets, in which case you'd want to launch ours immediately. It's totally possible that they could get Kim on some sort of "Red Phone Line" and convince him that it's fake before he launches, and that might even be the most likely outcome. But if the hacker timed this right (to some time where the president was asleep or harder than usual to contact) I feel like there is a nontrivial chance it could result in at least one nuclear warhead getting launched.