There is a certain false equivalence at play when you juxtapose what's going on in Iraq... or the Drone attacks in Pakistan/Afghanistan, with the acts of terrorism in Boston yesterday, and it's shocking really that supposedly intelligent people can't understand the difference.
Well, trying to distill your point from your post which is typically couched in condescension, I can see your point. Iraq, Pakistan, and Afghanistan are all mired in a continual state of instability and are rife with violence; basically, they are still war zones. The incidents of yesterday occurred in city accustomed to a city which has not had to deal with the war-torn conditions of Iraq and Afghanistan, and Boston is not a war zone.
That said, I can understand what GTFOOHWDBSA was trying to allude to; specifically, where is the outrage when people in Iraq die, and why the lack of coverage? Perhaps, it can be down to conflict fatigue on the part of a public being fed a daily diet of the carnage being visited upon many Iraqis.
With that said, I will make an additional point: the events of Boston are going to hit harder because it is closer to home. It is akin to a personal relative being the victim of a violent crime even in the midst of stories of numerous violent crimes being committed in your area. This is where I see the failure in GTFOOHWDBSA's point.