Do you believe that there is ever a justification for taking human life?
Then goes the spectrum. Suppose someone is taking your property, can you employ violence to protect it? What if there is 1% risk of death to the thief? What if its 10%?
I'd prefer the people whose job it is to make those assessments on a daily basis to have a strong moral and ethical framework, and to have the psychological and institutional support to maintain a connection with their humanity.