The problem is that, basically, invariably there's the assumption that such a piece of code is 100% proven and bug-free itself. You know, unlike the rest of the program and unlike other shitty pieces of DRM.
One of my favorite games when I was young was Robot Odyssey, the Learning Company game on the PCjr. Being a TLC game, about half of the fun was in the many tutorial/learning levels, and the other half was the game itself. Though I enjoyed the tutorials to no end, I was unable to properly re-wire the robots in the actual game, and so was only able to complete the first few levels (about 40 %) of the main game. I tried different strategies on and off for years to try and either fix or get around this odd behavior, but could never get anything to work.
A decade and a half later, I finally learned that the game had an odd disk-read-based copy protection scheme which, if it failed, quietly prevented you from re-wiring the robots, making it impossible to progress. However, I had an original game, box, manual, and all, yet the DRM bugged out on me.
The point is, had there been a more blatant or clear message, we could have called TLC and asked for a replacement copy. As it was, I simply believed for years that I just couldn't figure out how to play the game.