As evidenced by?
Falsely presenting subjective viewpoints as objective would appear more rational. It isn't the trappings which make it rational or even distance from emotions. One can rationally make "non-optimal" decisions from subjective personal costs.
Would be curious to see data on this. I most frequently see an emotional appeal against authority, vague anxieties and fears and/or slippery slope arguments.
And covid vaccines being spike-only may be less effective against variants than whole-virus vaccines or actual infections. But flu shots manage to be ineffective a year later with whole viruses in them, so maybe that wouldn’t help.
They are certainly not using a scientific mindset - they are just using language that sounds scientific, so it sounds smart and solid. But is not, when you look closer and try to find their data and sources. But common people does not do that - and fall for it. It is basically fraud, in most instances.
One of my latest memories is the introduction of a test that can be used to test for Corona and flu at the same time. The relevant article headline spoke of a test to distinguish flu from Corona. This then turned into the antivaxxers saying that previous PCR tests could not distinguish corona from flu.
Nor does it evince the collapse of rational thinking. If people just suspended their critical judgement and did whatever they were told unquestioningly, there would also be no antivax movement, but their compliance would not speak to their capacity for rationality, only their bovinity.