There is a moral cost for treating life casually. When police kill a suspect who shoplifted $100 from a store and engineer some flimsy excuse to claim self defense when they flee or use excessively brutal force when arresting a drug user and possible petty counterfeiter isn’t so surprising when we have the public advocating for summary police justice rather than doing what they can to uphold the rule of law, which does not include gunning down criminals in the street.

Also, a whopping 2.3% of federal criminal cases go to trial already. So your other justification for capital punishment is that number is just too high?