military =/= civilian


According to the geneva conventions, non-combatant military occupations, including military personnel, medics, technicians, etc. are all protected as non-combatants, which means they have the exact same protections as a non-military civilian.
Legally speaking, killing nuclear scientists working at said NK nuclear sites would be considered a civilian casualty slash war crime. With that in mind, these theoretical strikes against nuclear facilities would be a violation of human rights, and would probably kill more people than have been killed by NK's nuclear tests, if any people were actually killed by those in the first place.