The worst case could be the one of an helicopter in stable forward flight , no longer obeying the commands of its pilot, and thus , with full power and perhaps ca. 1.800 to 1.900 RPM, flying towards the highway or a group of people. In this case, not at all uncommon, the survival of the heli must be secondary, it is much more important that it comes down as quick as possible, with the lowest possible rotor speed , as this the main danger for humans.
There is an easy solution for this failsafe situation: programming throttle to idle, pitch probably on 1 to 20, should reduce the danger of the uncontrollable heli to a tolerable and reasonable level.Those of us that ever had to experience the incredible force of a rotor on full speed hitting a human being, can understand the kind of damage control in the largest sense the "throttle -to-idle" failsafe programming can provide.The fact that the heli itself will probably not survive this ordeal is totally meaningless, after all it is only a heap of metal, protecting a human from injury or even death is so much more important.