It all comes down to a single word: innocence. The human in a womb is innocent. In a just war, one's opponent is not innocent. In capital punishment, the criminal is not innocent. And Jesus Christ took upon Himself all of our sins, that we may be forgiven. He laid down His life for us, that we may have salvation. He was tempted by Satan to forego being punished for mankind's sins and become ruler over the world. As the Son of God, Jesus could have said, "Yeah, you know what? I'm not gonna suffer and die for these bozos!" He had the power to destroy all those who would have harmed Him, but He used the free will given men, and He chose Life for mankind.