Just because there aren’t moral truths doesn’t mean a serial killer did nothing wrong. You seem to be stuck on finding a single contradiction and using that to dismiss everything else related as irrelevant. That’s not actually how the world works.
Similarly in physics, the existence of non-newtonian fluids, doesn’t invalidate Newton’s work in fluid dynamics.
Just because there aren’t moral truths doesn’t mean a serial killer did nothing wrong. You seem to be stuck on finding a single contradiction and using that to dismiss everything else related as irrelevant. That’s not actually how the world works.
Similarly in physics, the existence of non-newtonian fluids, doesn’t invalidate Newton’s work in fluid dynamics.