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I'm not a trump fan, but the antivax train has nothing to do with him. (Evidence: Canada is doing even worse then us when it comes to measles). If we want to fix this problem (we do), the first step is to recognize the actual problem, not to play the blame game on whichever politician you currently don't like!
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.