Well, there is that troubling 65-year track record where the Norks have never, ever negotiated in good faith, but maybe this time...
And Li'l Kim does have the object lesson of the one tyrannical dictator-type who did voluntarily surrender his nuclear ambitions, and that guy ended up shot dead, with large foreign objects crammed up his hoo-ha (and not necessarily in that order). If Kim likes breathing, then he has no reason to give away his nukes, and he won't.
This is a transcript of the meeting between Trump and Kim Young Squeal.
“You’re a tool.”
“I scared very scared.”