It's hard to listen to the "silent majority" when they don't speak. Pre-election polls are different from the FCC soliciting input from the citizens it is supposed to be working for.
The "silent majority" was not silent IF they actually voted. They spoke with their votes. Since the FCC's decision was not open to public vote, the comments WERE the way for American's to speak out.
By relating this back to your own example, imagine if Trump won because FAKE votes were cast in HIS favor (which, oddly enough, HE supports investigating even though he won). If FALSE comments were provided to the FCC through the ONLY official means to voice opinions, those comments are as bad (in terms of the FCCs decision) as voter fraud would have been in the election (assuming there was any voter fraud, waiting on that evidence).