Saberwolf_Prime: Oh but publishers said DRM is to fight piracy... and to fight used games, but they are forcing the honest customers to jump through more hoops, punishing them for buying legit copies.
Power corrupts...
Let's assume some are really clueless Lysenkoists. Others however are clearly not, they are smart but they are crooked. DRM usage usually comes down to 3 things. Cluelessness (as above), covering one's incompetence, and controlling the market and technological progress.
First one is obvious (some are just stupid). If you persuade them enough, they might revert their attitude. Other two however are what you called "power corrupts" cases, and not that easily fixed.
With second one - imagine some release getting poor sales (because it's just bad). And execs which release it have to respond to their board or whoever. And they say - "see, sales are poor because of pirates! And we didn't sit idle, we put another DRM in it!". I.e. they know it's all idiocy, but they need to show doing something, otherwise they'll have to admit they released some junk which no one wants to buy.
Third one is the worst. It's when DRM is used to subvert standards, lock in manufacturers into something (video disks is a great example of such idiocy, when outdated technology is still in use only because of the corrupted media industry). Another example is using DRM in locking mobile devices into certain networks and so on. That's pure corruption in practice.