Guess what! Fats in the diet don’t cause heart disease any more than masturbation causes hairy palms and blindness.
And there’s never really been any evidence that they did, other than an inconclusive statistical study from one researcher back in the fifties.
But that didn’t prevent it from becoming a Scientific Fact which everybody knows and nobody questions.
I’ll grant this to the global warming deniers: it is indeed possible for a “scientific consensus” to be totally wrong.