I would call "murder is wrong" a subjective statement because it is a (utilitarian) ethical question.
Allowing murder is not conducive to the future of a healthy society because it removes personal responsibility and undermines structure. This is a perfectly valid approach and it works at keeping the cattle together. At the individual level, however, it breaks down simply because of differing personal perceptions. What is not justified to one may be acceptable to another; consequently, Right and Wrong are balancing acts between different groups to achieve the most happiness/safety possible. "It works", but it's still just a subjective judgement backed up by conditioning.