Inanimated, while we are talking about the religion of peace and its adherents, let me illustrate your astute observation (ok, I interpreted you here as getting somewhere) about human nature with another example.
By far the people who garner the most sympathy from the Muslim population throughout the world are the "Palestinians", at the hands of their Jewish oppressors. No doubt that the Muslims here are all too familiar with the Muslim narrative regarding that conflict. But how many Muslims here do you think is aware of the horrors of the "Bangladesh Liberation War" where when the then "East Pakistan" endeavoured for independence, West Pakistan (which would become the current Pakistan) unleashed a military invasion against the former that killed between 300,000-500,000 Bangladeshis and made refugees of 40+ million. In fact, in that war, most of the Arab states sided with West-Pakistan and condemned the Bangladeshis for their "anti-Islamic nationalism".
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As another example, one might think that the "Palestinians", who seem to feel themselves as categorical victims, would sympathize with other victimized peoples. But in 2006, the "Palestinians" were among the few peoples who mourned this man.
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This is a man who enacted brutalities on another peoples, the Kurds of Iraq, far more horrific than anything Israel has ever done to the Palestinians on any single occasion. In fact the Kurds, a dispersed peoples divided by several states in their own lands, have been subject to the terror of the Iraqi, Iranian and Turkish states for most of the history of these states as nation-states. And yet, they receive no sympathy from the Arabs, Persians or Turks.
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Here are two sad truths of human nature my friends: first, sympathy is often subject to social, economic and political reality, that is, it often serves the self-interests of the sympathizers. Second, sympathy, like most other of the cooperative impulses of man, goes hand in hand with tribalism, that is, it is all too human of a behaviour to easily recognize and inflate the sufferings of your own group (whether ethnic, sectarian, religious etc) and allies, and too ignore and undermine that of others, especially your enemies and rival groups.
Indeed Inanimated, what is truly, as far as the question of human suffering is concerned, the difference between African warlords exploiting children (there is an estimated of over 100,000 child soldiers in Sub-Saharan Africa alone) and what ISIS is doing to the Shiites, Kurds and Yezidis? Why should we stop the later, and not the former?
You see this is why I can never take ethical arguments for military interventionism seriously. The Neocons and liberal interventionists, who are the chief peddlers of this type of propaganda in the media, now want us to bomb and invade Iran (and possibly Iraq again and maybe even Syria) -so that supposedly the Iranians can finally be set free of the yoke of the mullah and no doubt turn Iran into the Hollywood version of America 2.0, as that is exactly what a majority of Iranians secretly want to do (as farcical as this might sound, this is a common thread I read in the Neocon political literature these days, though they will not frame it nearly as bluntly as I).
And don't get me wrong, I am no sanctimonious hypocrite. I am well aware of my own biases (for example, I loathe Islam, and would prefer that we take non-violent measures to reduce the Muslim immigrant population in my own country and in the western world in general), but I think it a wise precept to attempt to see the world as it is.