Norse, are you on something? You seem to be evading logic however hard it tries to find you. The prison system doesn't kill people.
In fact, prisons accept that the judical system has flaws. Think about it - we live in a democratic society, and not everyone (in the UK, less than half want the dp) feels about criminals in the way you do.
You continually call life imprisonment a 'harsh punishment'. Yes - it is. I don't think any pro-cp debaters can dismiss that.
And more than once you have compared it to the Death Penalty asking 'what's the difference?'.
Based on that alone - you have defeated your own point. The DP is harsh and takes away the part of a person's life that counts. However, it is reversible. The DP, as we all know, is frighteningly not.
You may dismiss those who die innocently, but the rest of us don't.