That is a complete load of tripe. You guys chose to ignore what was said to you, you chose to refuse any other alternatives given and finally you chose to shoot because "You have the gun" as you put it. You could've chose to listen, you could've chose to be considerate and you could've chose to respect what happened before you came along.
But you didn't.
Perhaps you should consider your choices rather than trying to blame some inexplicible force for your actions?