Everything's got a purpose, really - you just have to look for it. Cats are good at keeping old dogs alive. Loss helps you reach for gain. Death helps you celebrate life. War helps you work for peace. A flood makes you glad you're still standing. And a tall boy can stop the wind so a candle of hope can burn bright.
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.
Have you ever noticed that it takes a textbook dozens of pages to say what normal people can cover fast? Example: What was the full impact of World War II? Clear-cut teenage answer: we won.