Because those that have "come forward to face the heat" have been championed as bastions of credibility by redhats. GTFOHGOP sources?
I’m sure I could find a source that says “Fake News” upon every press of a button.
Either you believe strongly enough about your statement that you come forward and face the heat, or remain uncredible because either the statements were made up by someone outside the Whitehouse or someone in the Whitehouse wants to draw a paycheck while attempting to undermine their employer.