Adding to this, I really hope this isn't the digital version of WMDs-in-Iran-type-event where we make up convenient excuses to intervene in countries that are somewhat problematic.
The USA won't intervene in a country with nuclear weapons and a few kilometers from Seoul for crime without physical damages. NK won't hacknowledge it because they want to appear as a victim in every way possible.
This isn't a good enough excuse to intervene.
North Korea routinely provides much better reasons to intervene.