The pros and cons of war are difficult. One pro is that war can strengthen an economy by providing jobs and stimulating the market, also winning a war can prevent many unwanted things from happening, ie the Allies defeated Hitler and stopped a genocide. The cons include death and destruction. Wars are fought for a number of reason, whether it is because of political tension, resource control, or religious reasons people die, lives are ruined and one side always loses. The pros of a wars very rarely out weight the cons.