Stop "feeling" and start thinking for once. Reacting emotionally doesn't actually produce any good results or solve any problems.
What principle or practicality? Once their dead and cremated, they will never ever commit another crime or hurt another person. Only thing that needs to change is it should be something people will fear, it should be done publicly and school children should have to see it several times before becoming adults.
Be sure to work hard and get lots of overtime. People on welfare want more steaks and free upgrades to smart phones with unlimited data packages.