War exists because of psychological and economic reasons

Question: Can we stop war by praying for peace? 

Krishnamurti: I do not think that war can be stopped by prayer. Isn't praying for peace merely a particular form of emotional release? We think that we are incapable of preventing war and so we find in prayer a release from this horror. Do you think that by merely praying for peace you are going to stop violence in the world? Prayer only becomes an escape from actuality. That emotional state which results in prayer can also be worked upon by propagandists for the purposes of war, hatred. As one eagerly prays for peace, so, equally enthusiastically, one is persuaded about the beauties of nationalism and the necessity of war. Prayer for peace is utterly useless. The causes of war are manufactured by man, and it is of no value to appeal to some outside force for peace. War exists because of psychological and economic reasons. Until those causes are fundamentally altered, war will exist, and praying for peace is of no value. 

(JKRISHNAMURTI Ojai 8th Talk in the Oak Grove)