Your argument as a whole was a bit funny...
You use personal arguments about someone else as thinking in black and white -- then define people with different backgrounds as good or bad, according to our local cultural definitions.
Please read some history. It was no better, it was just not internationally infamous clan societies for a while. Then we had violent national states (check e.g. Polish deluge or the 30 year war).
But I think the same pattern is found everywhere. Most cultures were much more violent in the past. I think Pinker wrote a book about the phenomenon, he is good (I haven't read that but others).
(Let me note that reading about the Polish deluge was one of the shocks of my life, the Swedish school system really didn't mention much about the Polish side of it. I guess the Germans are the only ones that ever took any form of responsibility for historical atrocities.)
Of course their actions should be condemned but what you wrote is just wrong, a lot of them were like us until they stopped.. Most murderers do not born as murderers, they are made murderers.