Amazon has exercised substantial market power to get publishers to do what they want. If they really wanted to, they could have pushed back just like they have in other areas.
For one thing, DRM also works in Amazon's favour (reselling multiple copies)
For another, DRM is a pretty big sticking point for copyright holders, music, text, whatever. It's the one big thing that publishers all think that their business model depends on
The point you are responding to is at least partially true. Re-read it and see. Your brutal "No" only serves to discredit your own (partially true) argument.