The trouble with studies is they can be flawed.
This means 1 study can say one thing, but there can also be another 20 that say something else.
This is now why we have Cochrane Reports in this country which look at looks of studies with a critical idea, to assess their value and credibility and to compare findings with other finding.
This is called evidence based medicine.
There is quite a lot of people who would like to see the end of evidence based medicine.
Why?
For political reasons: it doesn't fit with their narrative of government conspiracies and cover ups. Its something that can (and is) being exploited to undermine certain political beliefs. Particularly from the Christian Right, who don't like science in general because it tends to be viewed as incompatible with their beliefs. Also fear of X empowers Y by getting the public to believe in the fear.
For economic reasons: lots of people make money from dubious beliefs about medicine - particularly in the private sector. Not everyone believes in 'Do No Harm'.
Not to mention the historical issue and the fact that autism is simply better recognised and diagnosed when in the past this was not done.
It unfortunately also prays on vulnerable families trying to understand why their child is autist and it put children at risk of dying. Intelligent credible people, who you'd never expect to be duped, because they aren't like that.
The trouble is you won't believe a word of this. Why? You already have a belief based on little more than an urban myth and a dodgy dossier. Beliefs are damn near impossible to shift by being sane and rational and through using evidence. This is really the infectious disease of our time, not MMR related autism.
The fact that Trump is anywhere near this should set off the alarm bells.
The rule of thumb is presently, if Trump believes it, there is over a 90% chance of it being utter bollocks.
Good luck with this thread. I'm sure you'll convert someone. And put someone's life at risk. Nice work.