He is amplifying the issue, but you're right, Trump is a symptom of the underlying problem. The problem is that internet gave these idiots a platform to mislead people.

Back in the early 90s this wasn't much of a problem. Childhood vaccine requirements weren't some hot-button topic then. Most people would just get them when faced with the requirement. Most opposition was isolated to people who were otherwise contrarians already.

The difference now is that the internet is full of these isolated contrarians who are now influencing gullible people who don't know who to trust.