I agree with you also that abortion is murder and we need to work to change the positive laws. Indeed, even if the fact that abortion is murder is not in a man-made law, it is still a law of nature and natures God. Although I dont agree that cases of self-defense are ever categorized as murder. There is a moral "double effect" there. When you resort to self defense and the attacker gets killed, your intent was not to kill him, it was to defend yourself. Morally and legally, that is not murder.
I don't disagree there. I was referring to cases where innocent people who bumble into the wrong place get shot by someone who thinks they are a dangerous intruder. That is a form of murder, since you are using deadly force without certain knowledge of what you are up against.