MMR is safe. It has been used routinely in other countries for nearly 50 years - countries like New Zealand (where it was known as 'Triple Vac'), which has one of the most advanced pharmacovigilance programmes in the world. If there was a significant risk then it would have come to light by now. It hasn't.
Anti-vaccers are frothing loons of the worst type. Selfish, ignorant people who put their children, and other people's children, at risk.