Every American IS responsible for it! These acts are being carried out in our names, and that's dishonorable. I totally think that people who do not oppose the military are supporting it.
That's not how it works. Desmond Tutu is wrong, and he applies volition where there is none in effort to assign blame. I can relate, but I cannot agree.
I think to look away from injustice is an endorsement for it to continue, which is a choice and an action. Karma racks up for it; it has an effect in the world.
I believe he says this to encourage responsibility in individuals rather than to assign blame. The maybe subtle difference in intentions is where I think values really live.