The anti-vaxx delusion is a contagious viral illness of the brain that enables the spread of biological viruses that do physical harm. This is not a free speech issue, it's a public health issue.
It is both. What it's not is a First Amendment issue. GoFundMe, a private entity, is deciding not to do business with a group of people. Anti-vaxxers are not a protected class (like race). This is totally legitimate and a healthy part of a democratic society.
One's view have consequences. The First Amendment just says they shouldn't have consequences from the government.
That said, yes, public safety is a real concern.
And that all the adults that got vaccinated as a child in the 50s, 60s, 70s, 80s and maybe even the 90s are no longer immune? But none of those people have been required to get immunized again to maintain herd immunity.
This means we've been at 50% coverage or less for decades. Maybe there is some missing information that needs to be discussed?
Also, Merck has been caught falsifying their data on at least one of their vaccines for decades. But this is not commonly shared or known.
https://www.courthousenews.com/Class-Says-Merck-Lied-About-M...
Furthermore younger kids are more likely to be killed or seriously affected by illnesses than healthy adults.
That is moving the goal posts. If adults get measles, they can pass it on to the kids. And the stated belief is that 95% immunity is required for herd protection.
Yet, we simply don't have that, and there isn't mass sickness everywhere.
Many of them might decline in efficacy but that can mean 90% effective which is very good. Furthermore many of them have mitigating effects if you do get the diseases anyway that reduce risk of death or complications.