A scientist makes observations, forms a hypothesis, tests that, submits it for peer review and winds up with something that might be called a fact.
Obviously, all of his facts are subject to retesting and refinement, whether by current peers or future generations.
An 'expert' has no such obligation. He's guided just by what he believes.
And because of that, the scientist is always making a sounder conclusion--unless the expert is also relying on science. Reality is a thing.
You choose your favorite cable news 'expert' and I'll choose mine...and I guarantee you neither is basing his or her opinion on anything but personal belief.
And that's the curse that we now live under. Beliefs are considered equal to facts.
But this is nothing new.
Reformation vs. Enlightenment.
Plato vs. Aristotle.
World without end, amen...