So, you're saying that the US is as barbaric, if not more so, than the folks that are using children and the mentally-disabled as bombs?
Wow!!!! That's pretty incredulous of you, Deck. 
No, I'm saying that to nip this suicide bombing problem in the bud, we have to kill all the Sunnis in Iraq.
The problem is there for you in black and white.
I mean it's not like killing people over suspected WMDs.
These suicide bombings are really happening. The best way to eliminate the problem is to eliminate the source, no?
By killing all the sunnis (28,000,000 x 32% = 8,960,000) around 9 million Sunnis we could cut off the insurgency and its suicide bombings at the source.
Of course the Sunnis might learn their lesson after killing only 4 or 5 or 6 million of them, but that's a chance we should take.
Why pollute the issue with crazy notions of tracking down the bombers or groups responsible for the bombings? This way, if we kill at least 4 million Sunnis we'll be safer while we are in Iraq.