Well, it is called an analogy, isn’t it? No one said it is exactly the same.
> One person can only have one car crash, ever, […]
Except not. As people who can be infected, infect others, fall sick again, and so on. People can have multiple accidents with varying degree of charm for themselves and others. Also, you forget that car crashes can also have more than 2 vehicles involved, especially on highways.
> a disservice to any attempt at getting antivaxers to understand the seriousness of the situation.
Well, I took for granted I am not talking to one. I would certainly need to use a different approach then. The issue with antivaxxers is that the reasons for their behavior often seems orthogonal to logical arguments, and aligns more with emotional responses like fear of the unknown and political and/or religious views.