You can't have it both ways. Either taking the life of an unborn child is murder or it isn't. If it is murder, then abortion is also murder. I'm surprised the liberals haven't been all up in arms about the Peterson verdict. Maybe their logically reasoning skills haven't figured this out yet.
Taking the life of a deadly assailant in self-defense is not murder, but taking the life a fleeing suspect usually is. Taking the life of a person who jumps out in front of your car at the last minute is not murder, but driving on the sidewalk to run him down usually is.
Like it or not, there is a similar distinction in the law for unborn children - hiring a doctor to kill him with your consent is not murder, but a non-doctor killing him without your consent usually is.