JoTheHot - my above post wasn't intended to answer your question about why people are nervous of MMR vaccines but I hope it does shed some light.
People are nervous of MMR vaccines for a variety of reasons.
The first being that two out of the three original brands are no longer used in the west due to them being unsafe.
The second is the high number of reports and court cases involving children reacting badly to the third brand which is now the only one remaining on the western market.
A third is that many people remain unconvinced over the safety of administering 3 live viral vaccines in one injection.
A fourth is that many of the studies designed to testify to the safety of MMR vaccines are fatally flawed and conflicted.
A fifth is the lack of alternative explanation for what has happened to children thought to have reacted badly to their MMR vaccine.
A sixth is that some people question the wisdom of vaccinating children for mumps and rubella when we are unsure of the longevity of the protection provided by the vaccine.
A seventh is that originally the MMR was touted as being a one off shot - now children are expected to get two and there has been talk of a third in the pipeline.
I could probably think of some more, but I'm sure you get the picture!