Interesting that you mention that, so the difference you want to point here violence from "mainstream society of a nation", will define the changing dynamics of moral character of a society.
So on one hand you have a society that is so radically polarized that the modern/mainstream society has already disassociated themselves with their fellow countrymen who are termed "extremists". A society which has seen widespread killings based of religious disagreement, political motivations, separatist rebellion, communal hatred, still holds a higher moral ground based on the actions a substantial minority demographics of what you term as the "MAINSTREAM SOCIETY".
WHEREAS
A society which is all inclusive, multi ethinic, multi racial, and has a constitution which doesn't differentiate between it's own citizens based on religions affiliations, a society that doesn't see separatism, nepotism, domestic terrorism, political violence, is still facing a "Moral decay", based on the violence committed by an extremely minuscule unaffiliated set of mentally derrainged individuals.
With all due respect, I am a little confused by the benchmarks of your comparison sets.