Is it really so irrational? How many people have the technical know-how and access to equipment to personally verify that COVID vaccines are safe for human consumption? (Can you even verify that on your short of running mass human trials?) And yet, by and large, most of us are not conspiracy theorists who wonder if the vaccine will secretly kill us or render us infertile.
There are often good reasons to trust the official narrative. There are often good reasons to distrust it too, but placing trust in people and institutions is often not so irrational.