Earlier quoted context omitted.
That's not a weird fear. I've heard of it happening in a specific case.
Do you have any evidence at all? And even if some doctor did that once, to be afraid of some one-in-ten-million evil doctor is still an irrational fear that costs a lot of lives.
It certainly isn't one in ten million "evil" doctors. Consider that you might be underestimating the likelihood because you want people to be organ donors. I'd say the main reason the official respectable stance is that you'll never have your organs harvested when you would live is that people want more organ donors so they fall for whatever belief helps make it happen.