Many are hostile towards a documentary film released in 2016: Vaxxed: From Cover-Up to Catastrophe. The film is currently available for viewing on Amazon Video, but beware that some are pushing to have Vaxxed removed from that venue. The film alleges a cover-up by the Centers for Disease Control and Prevention (CDC) of a purported link between the MMR vaccine and autism. 
Two immediate takeaways I got from watching Vaxxed are (1) single-use vaccines may be safer than the MMR vaccine, and (2) diagnoses of autism have grown exponentially over the past several decades.
The film claims that at least in some nations the single-use vaccines have been more or less outlawed. The single-use vaccines are “separate component vaccines” as contrasted with the MMR vaccine (combined measles-mumps-rubella (MMR) vaccine).  So, with single-use vaccines, one is inoculated separately against measles, mumps, and rubella, whereas the MMR (Measles Mumps Rubella) vaccine combines all three into one inoculation.
The other startling takeaway from Vaxxed is its claim that diagnoses of autism have been increasing exponentially during the past several decades. Back around 1930 through 1960 autism was fairly rare, but then its occurrence began growing sky high. “The number of people diagnosed has increased dramatically since the 1960s, partly due to changes in diagnostic practice; the question of whether actual rates have increased is unresolved.” 
The film Vaxxed notices the coincidence at least between use of the MMR vaccine and skyrocketing diagnoses of autism. One can’t help but wonder about the hugely hostile reception the movie has received in some quarters.
Which brings us to Nikolas Cruz, alleged mass murderer at Marjory Stoneman Douglas High School, who had been diagnosed as autistic. Nikolas Cruz was 19-years-old when the February 14, 2018 massacre took place. That means that around the year 2000 Nikolas Cruz would have been ripe for receiving the MMR vaccine. Inquiring minds want to know: Was Nikolas Cruz vaccinated with MMR?
——- Sources ——-
 “Vaxxed”, Wikipedia, accessed May 5, 2018. https://en.wikipedia.org/wiki/Vaxxed
 “Q&As about Monovalent M-M-R Vaccines”, CDC. https://www.cdc.gov/vaccines/hcp/clinical-resources/mmr-faq-12-17-08.html
 “Autism”, Wikipedia, accessed May 5, 2018. https://en.wikipedia.org/wiki/Autism