Oh, I know it sounds smarmy and retro, but that's only because we aren't used to analogies that don't include macho opponents in a battle of physical prowess. I'm not saying the spectator sports don't have a role in our culture. I enjoy a good basketball game now and then, especially if it's a collegiate match that involves one of our local teams. We learn something about teamwork and can watch a player develop his or her talent. We see green kids grow into confident and competent athletes.
Sports can even provide the illusion of community with other fans.
On the other hand, it can, like politics, divide people who might otherwise unite in a common cause more useful to the entire group. I confess I have a hard time answering that question. I'd much rather be doing anything than passively watching someone else hit a round ball with a stick or tackle somebody running with a funny-shaped ball. And don't get me started about boxing, which I find only marginally less brutal than the gladiator spectacles that satisfied the blood lust of the ancient Romans. I suppose spectator sports get the adrenaline pumping without the spectator having to exert himself beyond reaching into the bag of nachos or schlepping into the kitchen to retrieve another Coors from the fridge.