DRM just slows down how many people pirate stuff by making it non-trivial. If piracy was extremely simple and completely without risk everyone would be doing it, which in turn would start to cause harmful effects that they justify all anti-piracy stuff. I dont think corporations see it that way though, they are likely just bunch of idiots that want to squeeze even more from us.
Not defending drms or generally any anti-piracy stuff, but humanity might not be quite ready for 100% free information. Hopefully it will eventually happen though. All of you are fighting for our freedom by not giving up on this.