What was the purpose of the Kellogg-Briand Pact? Was it unrealistic?

The purpose of the Kellogg-Briand Pact was to prevent war by declaring it illegal. This pact was signed in 1928. between the United States, Germany and France, and it was named by its authors: U. S. Secretary of State Frank B. Kellogg and French Foreign Minister Aristid Briand. It renounced the use of war, promoted peaceful settlement of disputes, and aimed to prevent aggression. Obviously, the pact wasn't realistic, and world was not ready for this kind of agreement. Only decade later, the greatest war in human history started.