Are there really antivax people that would know the word "covariate?" That's gotta be a small Venn diagram overlap.
You see this all the time where people will pick up niche jargon and misapply it.
Edit: I would also add that parents regularly make choices for their children that involve larger amounts of risk.
Plus, there's a big difference between "young people tend to have less risk of death" and "young people have a 0% chance of death" like the person I replied to claimed.
They just don't use them correctly and/or appropriately.