I agree, but this is such a different class of threat with such different mitigations that it doesn't really belong in the same category as what we normally think of as "terrorism." Fighting small-time groups like al Qaeda and ISIS doesn't help prevent a nuclear attack by the likes of North Korea, and makes things worse by diverting attention and resources. So while this is an excellent argument for "try very hard to make sure North Korea doesn't nuke anything" it is IMO a counterargument for "maintain or ramp up the Global War on Terror."