How do you know there's zero threat if he gets nukes capable of being put on missiles? I think it's more likely he'd try to grab concessions from the West once achieved, but I wouldn't say there's zero threat to US.
The Democrats are a lot of times feckless when it comes to foreign policy. Many of them give signals they'll do nothing militarily, so North Korea is embolden to take the chance. If Trump administration's rhetoric (though stupid of Donnie to draw a red line on threats) doesn't get them to come to the table, sanctions that have no chance and don't have the purpose of crippling the regime certainly won't. I mean, those are the same guys who were scared ****less over exposing Russia during the elections because they thought Russia would retaliate by screwing with our power plants and stuff.
“The idea that Kim Jong Un’s decisions, particularly about his nuclear weapons program, are irrational is a myth,” Town said.
I see stuff like this all the time. It basically says the US will do nothing then.