US citizens and members of our society have a government protected right not to be killed and seriously physically wounded criminally at random and/or for some other person's "reason."
A civilian firing squad merits an airing as a solution which disposes of some violent actions and violent persons in a final, cost-effective and preemptive way that in some cases no other way can.
The cost-benefit is that millions of millions $ dollars are not spent by allowing persons who know themselves to be murderers and/or mass killers [even given their God-given and self-induced disabilities and conditions], to of their own God-given free-will, opt-in to a completely inglorious, routine, private, unrecorded firing squad death. This will NEVER be a Government, societal or any other's choice.