Chuck hits the nail on the head, though "coerced" is a tad strong. The FCC is predisposed to consider economic metrics above all others, and radio is an afterthought in its priority-list. So when a constituency comes in claiming to represent the majority of industry revenue (plus NPR, to add a patina of political legitimacy) and declares that the industry wholeheartedly supports this technology, that's the ball game right there. The debate over the technical or business legitimacy of HD Radio is just background noise. The policy record clearly reflects this.
The FCC is to blame because its regulatory perspective is skewed and there was no due diligence worthy of the name when it came to actually evaluating the standard.
The "industry" is to blame because its major players did foist this onto everyone, even though the record is quite clear there was a lot of resistance.
We (the public) are to blame because we've become so jaded about how public policy is made...and many of those who actually care about radio were wholly distracted by LPFM.
This is a simplification, but it is what it is.
Oh, and
Robert Struble himself called it a "science project," describing the initial efforts of USADR. If TL;DR: "The first efforts at creating an in-band, on-channel DAB system was a partnership between Westinghouse, CBS, and Gannett, and it was called USA Digital Radio,” Struble recalls. “The initial four or five years of the effort really were a big a science project. There were a lot of designs that were tried and scrapped, a lot of tests, some research and development, and some patent work. But it really wasn’t a whole-hog effort."