no, you believe in some magic fairy god that endowed everyone with the same moral standards.
clearly that's not the case as different cultures have different standards.
as cultures and ideals merge, certain practices and customs have fallen by the wayside.
some groups, for instance, used to think it was perfectly fine to burn non-believers at the stake and they also felt it perfectly fine to squelch free speech by burning a bookmaker who wanted to help others see his version of the light. they also found it perfectly okay to enslave millions, while working to death whole groups of people.
thankfully their morals have largely fallen by the wayside as human thought and philosophy evolved.