Orca don't "put words into my mouth" I did not say "question the safety" I said "undermines the credibility".
I think it is a matter of fact not opinion that MMR is not a cause of autism, such is the weight of scientific evidence. As you well know there comes a point in science where things become knowledge, not opinion. (Such as the case with evolution - people still question it - but I don't have to preface any comment about evolution with IMHO)
Therefore any journalist or person of medical qualification who spreads rumours that undermine the credibility of MMR, given the risks of non vaccination, is being irresponsible. To the best of my knowledge there are no other reputable hypotheses about dangers of MMR. And no evidence that single shots any safer.
Of course vaccines bear a small risk - everything in life does - but not as much risk as getting measles or giving whooping cough to a newborn sibling.