"Subjective" how exactly? There are surely some variations, but if this is about "my wallet has feelings too" morality, that would be all the more reason we'd need an (enforceable) code of ethics.
You could say for yourself "I personally don't believe in private property, so I don't see any objection with theft" but my hunch is that this argument wouldn't do much to calm the victim of your theft.
That proposed code of ethics in software seems like an attempt to create exactly such an agreement.