Ava has brought out an excellent point by pointing out that the connection made by Shaw between Darwin's theory and the WWI. i find such connection was very strange myself as we. I honestly do not think it is the introduction of Darwin's theory all of sudden "enlightened" leaders around the world, and then they realized there is nothing better to do than expanding through invasion. If we look at the history that the conflict between either two competing nation, religion or any other kind of social group has been stopped. Therefore instead of saying the theory triggered the WWI, I would rather say it is merely explains why would such conflict occur, other just WWI but all the wars took place in the past as well as many more that will come in the future.