Why aren't people being held accountable?

I came across this article postdated on Oct 11 2006, which indicated that 'Excess' Iraqi death at 655,000.   Pretty much, the money quote in this article said that these people would be alive if the invasion had not happened.  

Why has this not been constantly pushed and brought into the main stream media besides the one article? Why hasn't anyone been held accountable. We are responsible for this, but this is a responsibility that no one wants to acknowledge.  

This is the U.N. definition of genocide, 

...any of the following acts committed with intent to destroy, in whole or in part, a national, ethnical, racial or religious group, as such:

(a) Killing members of the group;

(b) Causing serious bodily or mental harm to members of the group;

(c) Deliberately inflicting on the group conditions of life calculated to bring about its physical destruction in whole or in part;

(d) Imposing measures intended to prevent births within the group;

(e) Forcibly transferring children of the group to another group

Even if this was not intentional, we did these acts, and someone in government should be held accountable.  

"The road to Hell is paved with good intentions."