Our problem is that we have to fight unicorns. Unicorns, of course, are fabulous horse-like creatures with a large spiraling horn on their forehead. They eat rainbows, but can go without eating for years if necessary. They can carry enormous amounts of cargo without tiring. And their flatulence smells like pure, fresh strawberries, which makes riding behind them in a wagon a pleasure.
For all these reasons, unicorns are essentially the ideal pack animal, the key to improving human society and sharing prosperity.
Now, you want to object that there is a flaw in the above argument, because unicorns do not actually exist. This would clearly be a fatal flaw for the claim that unicorns are useful, if it were true. Is it?