Vestin: Child abuse, domestic abuse... I don't even want to get into specific examples.
We live in a time of plenty, where the main factors of natural conflict have been removed, need for sex and need of food. But when these are in short supply, and someday they will be if the world population keeps growing, what will happen to the standard of morality which is currently held as a certainty?
You mentioned child abuse and domestic abuse but these are very rarely mentioned in the Bible or antiquity and it was not until 200 or so years ago in the West that they were even considered through a moral lens. In fact the Bible says you should kill your child if they won't obey! Oh, how morality has changed! While viewing through an anthropological point of view may lead to certain blindness, it also puts things into context and makes one realize that morality is a dynamic beast, and what is moral at present will probably not be as moral in the future. Since we are far from agreeing on a universal standard of justice it stands to reason that our current perception will inevitably change.
So at the OP, what is considered murder today might not be murder tomorrow so you should let your current standard of legality and justice dictate your opinion, while always being prepared for the certain change.
Edit: Don't get me wrong, I'm not advocating murder or child abuse in fact I'm against the killing of any people for any reason, but I don't want to let my personal perception of those things get in the way of argument. My past experience greatly contributes to my current opinion of morality but it's best to leave those aside for the sake of objective argument.