If you enjoy any aspect of the collective high standard of living in the US, its hard for me to consider you don't have blood on your hands from that. The delta blood from a very unknowable counterfactual (that Gore's response to 9/11 would have been significantly less bloody than Bush's, that Bush's response to 9/11 didn't prevent more local blood than Gore's would have) seems trivial compared to that.

Humanity is a social species that constrains competition within the group but pretty much runs no holds barred in competition between groups. If you are even alive today you are the beneficiary of a long line of winners in those violent confrontations, which I think pretty much means you have blood on your DNA and should stop worrying so much about your hands.