Set Up a System Where Something can go Wrong, and it Will

  You cannot set up a system where something can go wrong without expecting that, sooner or later, something will go wrong.
   We've done that. We've set things up so most every time a home invader invades a home, he (or she) will be able to find cause to kill the intruder. Now, what could go wrong with that scenario? Sooner or later, there will be a homeowner who shoots and kills an intruder who doesn't deserve to be killed.
   Or, do all intruders deserve to be killed?
   Forgive, but I think not.