I am not ignoring you - I am giving it some thought. The crux of the problem it to ensure that no one is unprotected in the potential impact area. Three ways to solve this:
1- figure the potential impact area and keep people out 2- provide protection 3- make impacts safe even after a failureThere are problems with all of these. A combination of the first two is used on professional ranges - people are kept out of potential impact zones, and the impact zone it limited by flight termination if the trajectory exceeds the restricted area. People who cannot, but virtue of the task, stay out of the impact/explosion zone, are provided protection. 3 is just not practical beyond modrocs.
I see no reason that a similar approach can't be followed by HPR. The only real challenge it coming up with some way of limiting the trajectory without resorting to a flight termination system - which is clearly impractical.
Brett