One selfish man unwilling to recognize he is doing more harm than good.
Tweeting out promotional links to the pages with those materials, while asking for donations on the top of the page? Well, I don't know if that's contempt for artists or just lack of common sense. But when they ask you to take down the material and you refuse...
The depository thing is a distraction. And they do have a habit of sensationalizing things in blog posts. So I understand where that commenter is coming from. Internet Archive is under attack from many sides but much of it is self-inflicted.
It is unwise to push these latter points with the outmost care without having awakened the masses and clarified your stances to decisors - it is unwise to be "right" in front of the immature. But the reputation damage remains about wisdom, not about pride.