The AACS-LA had to decide how to respond to the recent breaks. Someone recommended DMCA-based cease-and-desist letters to any site publishing the relevant integer. This 'someone' was probably a lawyer, and the suggestion proved to be counterproductive to the AACS-LA in a very predictable way. In the narrow context intended by the linked article, it probably is "the fault of lawyers".

The problems with the DMCA and DRM from a public policy, engineering, or free-market perspective are broader and more important, but they're not exactly news, and members of various other professions can help shoulder that blame. This move by the AACS-LA, on the other hand, has "what were they thinking" written all over it. I'm still trying to think of an angle where they get something out of it that was worth the (predictable) backlash.