What about all the people who get wrongly convicted?
You can be found innocent after time in prison,
but what good is that when you're dead?
The lesson it teaches is that if a country can kill it's people, then killing can be justified.
Look at which countries do continue to practise capital punishment:
China, Iran, Iraq, Saudi Arabia, USA...
Not countries I'd like to live in.
tooth for a tooth
What use is a pile of teeth?