Because it's not factually correct, it's stating a full on falsehood (no human studies) and then doubling down when challenged on this falsehood.

You can believe what you want about all sorts of things about the vaccine, but there _are_ fundamental facts, and that's what I find disturbing about this mode of thinking. Spreading misinformation on purpose and then covering it under the guise of "just my opinion, man"

And nobody said anything about censoring him or "deplatforming" him. But some basic human decency would be nice.

Does anyone believing an incorrect thing terrify you?

It's spreading it, willfully, that's frightening. The consequences of propagation of bad public health information, and also what it says about the possibilities of public discourse, when it's considered acceptable by people to simply ignore facts in favour of preferred falsehoods.

We can argue many things about the Pfizer vaccine. And it's his choice to get it or not. But telling people it underwent no human testing is lying to people.