Daedalus

Let's put all the Anti-vaccers, Flat Earthers, and Moon Hoaxers on several rockets and shoot them into the Sun... We'll inoculate everyone so they don't get sick and die on the way there, we'll make sure they orbit the Earth a few times so they can see that it's a sphere, and then we'll have the rockets fly by the Moon so they can see the lunar landing site but, after all of that, the rockets will take them to the Sun where they will never be able to infect others.