Let’s get real about the so-called threat of North Korea. For nearly 70 years the US has had thousands of military personnel, war ships, missiles, nuclear submarines surrounding North Korea. It is responsible for the division of Korea into North & South. It is the US that presents a sustained military threat to North Korea. So if they have developed a nuclear arsenal, it is to defend themselves against clear & present danger from the US.
Is it scary that they have nuclear capability? Indeed. Almost as scary as the nuclear capability of the US, UK, France, Russia, Israel, Pakistan, India, & China.