A very deep philosophical question. I like to believe that although some moral codes (what to wear etc) differ, some human core values are universal.



A very bad chosen example. Human leaders go through great efforts to inhuman their enemies ("them"). This serves as justification to enable one particular group ("us") to do all sorts of nastiness to their enemies ("them"). The claim is that normal standards for behavior don't apply when dealing with enemies - they're "inhumed", and all sorts of nastiness is not only allowed, but encouraged (beheading, torture, rape, blown up by bombs etc). Beheading is not in anyones morale code - beheading is what you do to enemies when moral codes are suspended.

The last 100-150 years, Western civilization has gone through great effort to extend the definition of human to your enemies, which are not inhuman and are not to be tortured or massacred. You may still shoot or bomb someone for some military gain defined by your leaders, but not civilians. This is a fairly recent invention.