Both scenarios come with predictable, observable patterns of behavior that might help prevent future attacks (given the implied unlikelihood of much being done about the guns they predominantly use in their attacks).

Source: https://boingboing.net/2023/01/26/most-mass-shooters-driven-by-personal-grievance-and-about-one-quarter-by-conspiracy-theories-and-hate.html

In other words, the victims would do well to weigh whether the anticipated large-scale carnage is, put bluntly, worth it, given the unlikelihood of victory.

Source: https://www.lawfareblog.com/revising-or-rejecting-reasonable-prospect-success-just-wars-lessons-ukraine

One aspect of a second Trump presidency that would increase the unlikelihood of successful North Korea diplomacy is increasingly antagonistic U.S. relations with China.

Source: https://nationalinterest.org/blog/korea-watch/donald-trump-and-north-korea-part-ii-china-will-still-be-key-207251