[bdk3clash]

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pure numbers game... CIA Factbook says Sunnis are outnumbered by 2 to 1. I severely doubt that Sunnis attack twice as much as Shiites, especially when problem areas are in places like Sadr City are Shiite.

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Are you talking about the makeup of the insurgency or of Iraq as a whole? (If you have numbers for the insurgency, could you give a link?) If you're talking about Iraq as a whole, what makes you assume that the Sunni/Shiite composition of the insurgency (and, presumably, attacks and deadly attacks on Americans in Iraq) would mirror the Sunni/Shiite composition of Iraq overall?

EDIT: Just to clarify, I'm not saying that you're necessarily wrong, just that it's unclear who is primarily responsible for killing American troops in Iraq, Sunnis or Shiites.