[nl]

Debate is pointless if you ignore contrary evidence.

For example, it's pretty clear that you are anti-vaccine. It's fine to hold that opinion, but as I'm sure you've seen the overwhelming evidence against your point of view I don't see any need in re-hashing the arguments.

In cases like this you may not be consciously trolling, but in my view arguing a dissenting view in the face of such overwhelming evidence exhibits the same damaging behavior patterns that a troll engages in. Given that, I think the appropriate response is exactly the same as the response to a troll, ie: a perfunctory link to counter evidence on Wikipedia (for the sake of casual readers), and a downvote.