If you call that an "effective" defense, yeah idk what to say. We went in there with impunity, didn't even use the full capabilities of our forces, changed thei

If you call that an "effective" defense, yeah idk what to say. We went in there with impunity, didn't even use the full capabilities of our forces, changed their government, killed over a hundred thousand of people, destroyed their economy, incapacitated their military... So can one individual cause a little damage to the US military? Sure. I wouldn't call it effective by any measure.