"For a failure to correctly prosecute the true criminal and subject him/her to either the death penalty or life in prison, the cost of that failure should fall upon the prosecuting attorney and his/her staff."
Now, a caveat exists, if the police manufacture the evidence which would exonerate the attorney and change the threat of prosecution to the police.
What I am getting from these and the rest of your statements is that, in your opinion, along with a death penalty for using a gun or a gun like object in a crime, you also want the Prosecutor, their staff, and/or the police prosecuted if, in your opinion, they fail to "do their job" (for any reason, it seems)
I know it is an emotionally satisfying thought, but, as stated, I do not think you proposal is even remotely workable in the real world.
First off, who decides when/IF the prosecutor has "failed"?? You?? Me?? some committee?? Chosen how, by whom, made up of whom?? etc...
Is it the prosecutor's "Failure" if they don't convict, and that person never commits another crime in their entire life? Is it only a "failure" if they don't get a conviction and that person goes on to commit other crimes?
Seems to me, that would be a matter of the free will of the person, not any responsibility of the prosecutor...
IF we were to prosecute our DA's and our police for failure to obtain convictions, (and based on a currently undefined set of parameters) who then would be left to do their jobs? Would anyone even attempt to???
I feel sure your intent is to "encourage" our DA's to do their jobs better than what is currently done, but I don't see how your idea is possible, or, even legal at this point in time.
You probably could make it work, if you were the Sole Autocrat with complete, unchallenged and unfettered authority over all matters on the earth, but short of that, I don't think it could be done. (and, even if it could be, it wouldn't be done fairly, now would it...)
The real problem is that people have free will. You cannot stop, or prevent evil unless you can stop people from using their free will. As far as I can see, the only way to do that is to stop people from living (meaning, KILL THEM), and that only creates dead bodies, who won't do what you tell them too, either....
I consider that a drastically suboptimal solution....