The editors of the Washington Post are alarmed about the return of measles to the United States:
This year is not yet one-third over, yet measles cases in the United States are on track to be the worst since a massive outbreak in 2019. At the same time, anti-vaccine activists are recklessly sowing doubts and encouraging vaccine hesitancy. Parents who leave their children unvaccinated are risking not only their health but also the well-being of those around them.
[…]
According to the World Health Organization, in 2022, 37 countries experienced large or disruptive measles outbreaks compared with 22 countries in 2021. In the United States, there have been seven outbreaks so far this year, with 121 cases in 18 jurisdictions. Most are children. Many of the outbreaks in the United States appear to have been triggered by international travel or contact with a traveler. Disturbingly, 82 percent of those infected were unvaccinated or their status unknown.
As the passage quoted above makes clear they lay the blame for the outbreaks solidly on those avoiding vaccinating their kids and the “anti-vaccine activists” sowing doubts.
While I don’t disagree with that I suspect there are other factors as well. Among those are the degree to which the public health bureaucracy has undermined itself. It only takes one lie to undermine confidence and during COVID the public health bureaucracy lied to us at least once. Furthermore they oversold the effectiveness of vaccinations, partly out of ignorance, partly out of good intentions.
Additionally, I don’t believe that most Americans understand that measles hasn’t been wiped out (like smallpox) but that materially universal vaccination against it prevents it from spreading. Measles can’t be wiped out until it’s wiped out everywhere and that appears very unlikely at present.
Finally, the strategy for dealing with anti-vaccine activists’ “sowing doubts” is through reasoned discourse and evidence rather than censorship. Censorship can come right back at you.