Is it really so hard to understand that the DPRK gains nothing from actually striking a target (unless and until it faces an existential threat)?
This is rhetoric.
North Korea isn't the dangerous party here.
We should all be -- and doubtless the international community is -- more concerned with Trump's reaction.
The most likely end-state here is: (1) more posturing by the DPRK, including more weapons launches into the Pacific Ocean; (2) joint exercises between Japan, the U.S., and South Korea; and (3) a fucking Twitter war between Pyongyang state media and Trump.
It's the third prong that's the real wildcard.
There are informal protocols in place here. Just like when the Russians violate U.S. airspace every so often and our fighters from JBER intercept them (and they tilt wings at each other to say hello, because that's actually a thing), this is the Kim regime's usual way of saying "Hello, we want food and/or fewer sanctions."
The danger isn't a nuke in the ocean or Twitter threats. The danger is Trump not understanding the complex history, including the informal protocols in play, and doing something fucking stupid.