Tell that to the victims of the Holocaust
What killed Holocaust victims? Gas. Why did they let that happen? Because the people forcing them to go in had guns. Why did they force them? Because they worked under a man who commanded that they be killed. How was he alive? Because he drank water, preventing him from dying of dehydration.
Humanity works itself into a fervor of anger sometimes. That is what kills people. The implements of anger are irrelevant.