How can you guarantee that North Korea is safe for tourists?

The words ‘safe’ and ‘guarantee’ can be misleading. Even in the country with the most advanced military force in the world, that is the USA, tourists have been killed in the past.  Despite tourist killings, murders and fatal accidents, you still think that the USA is a safe place to be, right? If you can die in the USA as a tourist, then you can die in North Korea as a tourist as well. Do you define ‘safe’ as ‘zero percent chance that a fatal accident will occur’? Commercial airplanes are considered safe despite fatal accidents.