Legislation in different parts of the world makes different demands of people regarding different vaccines. The US is one of the most extreme and also one of places with the lowest level of overall health - which is not random. Numerous specialists and a few studies have made ultra clear that the overall health of vaccinated children is LOWER than those who are unvaccinated.
The pharma industry has always refused to publish studies which directly compare the health of vaccinated to unvaccinated people - however, private funding has allowed this to take place relatively recently.
I do not agree that MMR is safe, no. My understanding is that each of the individual components of MMR, injected separately, with a time gap, is hugely more safe than the combination version which was field tested on living people and caused numerous problems.