I don't know why you want to attribute ulterior motives. Could it be that maybe it's possible that some were actually impressed and inspired by Mike Mentzer and then became interested in how he attained his physique?
And as far as 1980, people always mistake that it wasn't so much that Mentzer felt he should have won when in fact his main beef was that Arnold should not have won and he had the show fixed in his favor. Mike was not alone in that assessment. There was a reason many of the top bbers boycotted the next Olympia and the ABC decided not to air the broadcast of that competition.
Mike was entitled to his opinion that Arnold Shouldn’t of Won
Other than Himself Whom did he think should’ve won.
From the pics and videos I’d have Arnold Then Zane, Mike / Dickerson / Boyer
Fighting for 3rd.
Though not at his Biggest & Best Arnold had enough to to win.
Mike should’ve added some chest & back fullness and competed in 81
Instead of letting his annoyance at Arnold ruin his mental state & life.
Sad that Arnold / Him losing had such an impact , The excessive use
Of Stimulants didn’t help either.