I think this might be one of those cases where how it is is a function of how you look at it, or the respective
perspectives each of us is taking on the situation.
The perspective I am taking is that while it is clearly sub-optimal that a non-trivial percentage of the population "has issues" with taking vaccines, it is also sub-optimal to not think strategically about how to act when one finds oneself trapped in an environment (Planet Earth) with such people. I don't disagree at all that something is "on" anti-vaxxers to educate themselves about vaccines, but understanding the metaphysics of how to respond to such people, and the consequences of one's response, is also "on" everyone. You may not like the emotions of the people in your outgroup, but don't forget that some people do not like your and your ingroups emotions either - like many things, it is a two way street, even though it seems otherwise.
> Discussion should be science vs science, let the truth win. unfortunately a 2 way street.
I am not a fan of artificially constraining methodologies, or relevant causal variables - generally speaking, science does not take phenomenology into consideration when considering vaccines, whereas (proper) philosophy would take science and everything else causally relevant into consideration. I strongly oppose those who insist on suboptimal thinking methodologies (as you strongly oppose those who you believe are acting suboptimally), especially when it is enforced.
> Your style might be better suited to a lesswrong forum.
It might also be more suited to optimizing interactions between not entirely rational humans of all psychological tribes. I think dialogue and (attempts at) understanding are more suited than presumption and antagonism. I can acknowledge that it is plausible that I am wrong on this, but I suspect I am not - as you say: "let the truth win".
Here is something that I believe is very interesting and relevant: I propose that if abstract instances of such topics come up (say, a psychology study on logical fallacies, interpersonal communication, etc), most commenters on HN tend to align more with my take here, but when controversial, object level instances arise, people tend to act otherwise.