No, just responsible for what happened. No invasion, no 100 k plus deaths. It's really simple.
So tell us. How many of those resources that the insurgents would of been used against the US or Israel had they not been expended in Iraq and Afghanistan? How much money, munitions and effort did the Iraqi invasion cause to be expended there instead of focused towards America itself?
Does it such ass that troops get killed and maimed there? Sure as hell does. But then again, if that resource is used against them there, it is not available to be used against US civilians. It is part of being in the military. If a US Citizen is going to die from an attack from outside sources, it is every military members sworn duty to die before a single civilian is hurt. It is one of the reasons they exist. They volunteer to put themselves in harms way so that that harm is not focused against the ones they love and care about back home.
We were sitting on Saddam for 12+ years. During that time, he didn't do much. How much longer and how much more should we spend sitting on him to ensure his good behavior? How many of our own resources were tied up with sitting on him?
For every bullet, bomb, bomber, etc used in Iraq and Afghanistan to kill other Afghans and Iraqis, how many US Citizens, Brits, Israelis, etc would of died if those resources hadn't been used up in Iraq and would of been used elsewhere instead? We don't know, we can't know, because we forced those resources to used there instead.
Does it suck that so many Iraqis died? Sure, but, from our point of view, better that some Iraqis die than school children and innocents in the States or in the countries of our allies die instead.
So, yeah, no invasion may equal no 100K+ Iraqis dead. But then again, that could of meant thousands of Americans/Allies dead instead. We chose to have them use those resources there instead of here, so we will never know what would of happened had we not invaded, but since all those involved against us and against each other there could of used those resources here instead of there, I choose to believe that that choice was a good one.