Here's the thing: people love to trust experts and, also, love to not think for themselves.
And they do trust experts, i.e. when it comes to having their cars repaired, getting medical treatment outside of COVID, etc. It's not like millions of people came up with using malaria medication and horse dewormer on their own after conducting studies in their basement. They are following other people, while, ironically, praising themselves for being independent and most certainly not sheep (it's horse dewormer, after all).