There's a common idea that morality and ethics is culturally dependent, and varies between different cultures, each 'equally valid.' They make out like different groups have an entirely different conception of what's right or wrong, good or bad, as if they're aliens to each other. While yes, in some ways it does vary, I personally feel most humans agree deep down what is good, desirable, or bad and undesirable.
Most want peace, goodwill and friendship, believe in murder, assault, rape, etc is wrong. Unless it is justified/sanctioned by an external agent. War and violence may be glorified, but I think certainly once a certain self-awareness is reached there's an almost universal awareness that pride, greed, bloodlust and restrained hatred and anger, perhaps uncontrolled lust, is often the cause of, or symptomatic of, suffering.
One may have varying laws around what is considered permissible killing, both human and animal, permissible to eat or wear, a relationship arrangement, or a sex act, partly influenced by customs and religion, but to me, there's an underlying shared sense of ethics universal to humanity. Whether this comes from God's divine law, or something naturally innate in us, I think the fact we're the same with generally the same dreams, hopes, desires, fears, insecurities, is more important than any cultural variations in how we self-legislate.
Postmodern thinking makes everything a construction of individual or culture, everything being equally valid, but if that's the case, is it our right to say, protest the injustices that happen in other countries? Some might see my words as an attempt to deny the differences; I'm not doing that, but am rebutting the idea they're so pervasive that they exceed the inherent similarities. Seeing certain cultures or races as immoral degenerate savages has often been used as an excuse to dehumanize and exploit them.
