And the ideal number of suicides is 0, and the ideal amount of spyware is 0, etc. All of these are targets, but an ideal doesn't give you further information on how to prioritize
But again, practically every country has managed to being the total number of school shootings to 0. Which tells you that it’s not a particularly hard problem.
Regardless, this makes it very different from a 0 suicide or 0 spyware goal. Those don't have a similarly reasonable theoretical solution.