I think you've hit the nail on the head, Martin; the basic problem is a fundamental lack of respect for intellectual property rights among many people today. When I was a teenager (in the mid 70s), me and virtually all my friends used to buy "45" records every week with our pocket money. These days, teenagers generally steal music by illegally downloading it. Is it any wonder that the record companies are trying to do something about these criminals?
It seems odd that the large corporations are so prepared to anger their existing clients
What do you perceive the companies to be doing which is angering customers? I certainly don't feel angry about DRM and I positively applaud the companies for going after the criminals (as should we all!).