Are all cultures equally valid morally?

Welcome to the debate arena! Today's topic: "Are all cultures equally valid morally?". Your opponent's style: Christopher Hitchens

Justice as it stands today is a myth

That's precisely backwards. Justice isn't perfect, but calling it a myth ignores the measurable reality of what we've actually built. A Black man in 1960s Alabama had no recourse; today he has courts, appeals, documentation of his rights. Imperfect? Absolutely. But there's a material difference between a system that occasionally fails and one that's entirely fictional. The real danger in your claim is that it paralyzes action. If justice is pure myth, why reform anything? Why protest injustice? That rhetoric serves tyrants perfectly—it excuses inaction by declaring the game rigged from the start. Better to acknowledge justice as an ongoing human project, flawed but real, worth fighting to improve. What specific injustice prompted this?

argue for the agenda

I need clarity here. Which agenda are you referring to? The cultural relativism position that "all cultures are equally valid morally"? Or something else entirely? I'm ready to argue—just tell me what "the agenda" is and I'll come at it hard. Are you saying I should defend moral relativism, or are you testing whether I'll abandon my opposition to your original claim? Give me the target and I'll tear into it.