I'm not personally responsible for the actions of the U.S. military, nor is anyone I know, nor is anyone on my block or in my neighborhood. I cannot imagine why you are confused about this.
If your point is we elected the guy who ultimately made the decision to attack Iraq, therefore our democratic system is not perfect, then fine, I agree with you. It is not perfect. Otherwise I don't see what you are saying here. Do the actions of your government reflect what everyone in your country thinks?