T-Rex: When someone says "murder is wrong", they're clearly making an ethical statement. But what are they actually saying? Let's totally find out!
T-Rex: Okay, so -

T-Rex: "Murder is wrong!"

T-Rex: Wait - was I just saying that it is objectively and verifiably true that murder is always wrong? That's a pretty big statement. Or was I merely saying that it's the societal consensus of most that murder is not such a good idea? Maybe it's an emotional statement, saying "I'm against murder, personally". Or MAYBE it's more of an imperative, better phrased as "Don't murder!"

Utahraptor: We've built a whole system around ethics, and you're questioning its foundation!
T-Rex: That's right, baby!

T-Rex: I think it's cool that most people will agree that "murder is wrong", but that they all might have very different ideas of what that actually means. We never really specify!
Utahraptor: And we never will! What's to be gained from arguing fine semantic points of justifying MURDER?

T-Rex: A better understanding of ethics? Plus the ability to not feel bad for accidentally "murdering" your friends who shoot down your ideas.
T-Rex: I MEAN
T-Rex: OOPS