Deer Hunting Ethics question

[DA COVE]

I have taken head shots before with success. But what changed my mind on it was with a 150 yd shot from a 7 mag being about 2" low and removing most of the lower jaw. Had to track it and put it down. (about an hour after the initial shot, and she was running.) It would have probably bleed out finally, if not it would have starved. It's also not real pretty to look @. Some prospective hunters may be turned off by the sight..IMO.