@maxdancona,
You can be a cultural relativist all you want, and insist that nothing is inherently wrong or less valuable than anything else--it just depends on what is accepted and valued by the culture in question, that's all.
Africa, for example, has a long, ongoing history of tribal conflict, highlighted by extreme brutality and savagery toward the "other" tribe. That's just part of their "culture." Muslim countries accept and generally approve of killing homosexuals and mutilating women---that's just part of the "culture," and is hence immune from criticism. It's what they believe in, so it can't be "wrong."
I don't buy that line, but even if I did, the fact would remain that cultures are DIFFERENT. They are not "the same," even if you want to say that every one of them is "right."
America has a long-standing history of freedom, independence, democracy, etc. It rejected the culturally approved of monarchy of the Europeans. But these values are not shared by all cultures, and are, in fact, openly denounced and opposed by some.
We don't need them here, even if they are 100% "right" is their cultural habits, from their perspective. They will not fit. There's no reason to try to pound a square peg into a round hole. It aint gunna work.