Thus sayeth the late Alexander Pope and as he was something of a deep thinker and I am not, I will not argue the point. The phrase came to mind after I read a report on the recent military trial of a young Israeli soldier who shot dead an already wounded Palestinian terrorist who had been subdued fifteen minutes earlier. The military court convicted the soldier of "voluntary manslaughter" and sentenced him to 18 months in prison, although the prosecution asked for 3-5 years. The soldier's defence was that he thought the prisoner still posed a threat because a knife he had used was nearby and also he thought the prisoner might have a bomb-belt.
Needless to say, the result has caused a furore and divided the Israeli nation. It rather reminded me of the case 'over here' involving a Marine NCO who 'offed' a wounded Afghanistan fighter after he had been taken prisoner and who was convicted and imprisoned and is now fighting to have his sentence reduced.
What can you say about such cases? Not much, unless you were there and had detailed knowledge of the background and the particular incident. So I will not say much except that, in general, executing PoWs is wrong and anyone who does it should be forced to face the consequences in a court of law.