Why do anti-vaccine people get so upset when told to produce factual evidence?

The problem is that anti-vaccine sentiment is NOT harmless.

Anti-vaccine sentiment means we now have diseases killing children that were effectively eradicated 20 years ago.

Anti-vaccine sentiment means that we don't have a Lyme disease vaccination because the cost of fighting anti-vaxxers exceeds the profit from selling the vaccine.

So, if we look at the balance, anti-vaccination causes real, demonstrable problems while pro-vaccination has yet to have any demonstrated factual downside.

So, yeah, we now have preventable diseases running amok because the logical community was tolerant about anti-vaccination instead of stomping the anti-vaxxers into the ground like they so richly deserved.

Now does the vitriol make sense?

The attitude seems a bit out of place but I understand your position more now. Thank you.

>The attitude seems a bit out of place

Not if you have children.