If national currencies are so obviously created out of nothing for the sole benefit of a small elite at the expense of everyone else then why isn't there a more cohesive opposition to this system?
A somewhat glib (although also with a kernel of truth) answer is bread and circuses.
But mainly, I think, the reason is that it's done slowly, bit by bit, rather than all at once. We are the frog in the ever-heating pot of water.