Aids was treatable in the late 80s
Zidovudine could extend life expectancy marginally. But patients regularly built up a resistance to the drug and eventually succumbed to the illness.
HAART was only introduced in the late 90s and did not become commercially available until the 00s. It was also a cocktail of drugs with a YMMV performance. So you needed to regularly administer treatment and constantly follow up.
PrEP and the long lasting injectables didn't arrive until the '20s.
We are also seeing a return of measles because again the algorithm + media addiction pushing people to become antivax.
We had antivax movements for as long as we've had vaccinations. This problem goes back over a century. You just don't learn about the Anti-Vaccination League of America or the the UK National Anti-Vaccination League, so we treat modern vaccine hysteria as novel.