Just because it's not something you're into doesn't necessarily make it nonsense. If it were so nonsensical there wouldn't be bands who make tons of money off of it. It's not my favorite thing in the world, but neither is baseball, stamp collecting, or many other things. That doesn't make it ridiculous. It just means that I, personally, don't see the point in it. I'm fairly certain there are many people who would think I'm a bad parent for taking my child out shooting and letting him participate in such "nonsense". Just because you or I or someone else doesn't see the point in something doesn't mean that other people don't.
Ok then, what's the point of screaming into a microphone? What is it I'm not getting?