That's because we don't respect said "experts" when the vast majority of them are whackadoodle and many of them are simply trying to cash in on vaccine fears by selling seminars that scare people, vitamins, alternative treatments, etc.
On a fundamental level I worry it shows the rot in our society.
Americans, especially conservatives, believe in truth. That the world is not relative but there is a fundamental and knowable reality. The twin pillars of American greatness have been Biblical truth and scientific truth.
It started as a radical movement on the left, but the idea that there is no truth has infected the right.
“Nothing is true so I will do whatever I want” is a civilization destroying ideology.