Probably unecessary agreed but I'm afriad the phrase
"IMHO (and I know this will annoy some) the parents were looking for someone to blame for their childrens' autism. (Duck and wait for things to get thrown at me.)"
could be construed as rather strong provocation.
Especially when (as you know) a very good friend of mine watched her child disintegrate before her eyes in a matter of weeks following the MMR. That sounds meoldramatic but I don't know how else to explain watching your child go from normally devloping, communicating, pointing, talking, to mute, screaming and smearing shit on the walls within weeks. To hear from someone who has never met her, that she just wants someone to blame is a a little too much.