They marched. Not for themselves. They marched to remember the ones who didn't make it back. They marched because seeing so much loss can teach you about life. they marched because we're all fighting a war whether we know it or not...a war for our minds and souls and what we believe in.
You cannot measure the loss of a human life. It's all the things a person was, all their dreams, all the people who loved them, all they hoped to be and could give back to the world.