If you look to society, you're going to get a resounding yes, these systems are needed. Our society, as it currently exists, is based enormously on systems of morals that tell us right from wrong, so of course society is going to say you need these systems, because society itself is based upon these systems. Since you were a child, society's morals were forced upon you, repeated constantly until they became unconscious behaviors, reinforced through rewards for obedience, and punishment for disobedience.
So how moral is society, really? Look at the big rule, "don't kill". That's not really the rule though, is it? It doesn't apply to plants and animals, so it's more like "don't kill other people", but that's still not how it really works, is it? We're taught that sometimes it's okay to kill, so the actual rule is something like "don't kill other people, except when the authority you serve tells you it's okay". That's how it really works, that's the paradigm most people operate under. Sometimes your religion, government or tribe tells you it's okay to kill, and then you can go kill people and it won't be wrong, right?
"Don't kill other people, except when authority tells you it's okay" when put that way, one of society's core morals doesn't sound so moral, does it? What happens when authority becomes corrupt? A better question would ask what would happen if authority wasn't corrupt, that's more of a mystery.
