What arguments were given against war

It takes more lives than it saves sometimes. Most of the people fighting in wars did not come of their own free wills. Depending on how bad each war is, more and more people can die. Entire armies can be eradicated in seconds now with the use of bombs. Being in the right or wrong place at a certain time one moment sooner or later can be the difference between life and death for any soldier or participant of war.