In an African tribe, when someone makes something wrong, they put him in the center of the village and for 2 days they tell him all the good things he has done. They believe that people are inherently good and that every bad thing they say is just a cry out for help… (1)
The evil is out there.
And the only way to defend against it is to use good.
Try to punish and inflict evil on a person who has done harm,
and you will burry the goodness inside him for ever.
Jesus Christ died and forgave his killers.
Sure almost none of us has the strength to do something like that.
But this is exactly what shows us that this is the right thing to do…
Some of Britain’s leading scientists have called on the government to grant a posthumous pardon to Bletchley Park codebreaker Alan Turing. Turing was convicted of gross indecency in 1952 after acknowledging a sexual relationship with a man. Professor Stephen Hawking, Astronomer Royal Lord Rees and the Royal Society’s Sir Paul Nurse are among 11 signatories to a letter in the Daily Telegraph. They urge David Cameron to “formally forgive this British hero”. 
The government of England (the former… United “Kingdom”) has already rejected another call to pardon Turing in February, when it was presented with an online petition with more than 23,000 signatures.
The “progressive” (atheistic?) England has a hard time forgiving. But when Dawkins shouted for the hypocrisy or the uselessness of Pope’s move to acquitte Galileo, many people nodded in agreement. You see, it is easy to criticize others for their mistakes (even though the Galileo case is not 100% the fault of the church – see here or here for a more detailed analysis). But it is very hard to acknowledge your own…
No matter how much science progresses, it will never reach the culmination of humanistic philosophy reached by Christianism with the “Forgive thy enemy” advice.