what are you talking about?
it's a late hour, but your comments make no sense at all.
such as:
Arguably the most stupid comment ever posted. By direct implication, this statement asserts that there are no civilised peoples on earth, because various peoples have been doing exactly this to various other peoples, or attempting to, for all of recorded history, and very likely for all of history, period.
''Do not allow'', forsooth? What rubbish. What would you have, say, Norway, Germany, Japan, Australia, India, Chile, or the US do here? Issue a stern reprimand from the UN? Dispatch legions of lawyers in aid of your wonted ''prosecution of mass murderers''? Invade?
The point is here that there is exactly no external way to prevent, or halt once in progress, such slaughter in most cases. Further, there is no external way to prevent future retaliation, aka payback, generation on generation. For further details, see the Balkans.
As to policy, see the famous prayer of St. Francis.