Everyone seem to underestimate how sacred a human's life is. People sacrifice so much for their child, so much hardship, struggle, victory, demise. We are all sinners on the inside, and we've all broken some rule or hurt someone, physically or mentally. We all make mistakes and in the end the judgement should come from divine powers, not fellow humans. If one decides to murder their neighbor, they should be justly punished and live out the rest of their life in prison, not given an early end to their precious life.
True, the victim lost their precious life as well, but what good comes out of more death?
What about the cost to keep them alive, and the fact that the victim's family may feel as though the murder was never justified?
And somehow putting money and revenge above a human's life is the right course of action? People aren't liabilities, they're living organisms that deserve a chance at life.