It's a core characteristic they've learned from HitlerPig, who learned it from his mentor Roy Cohn, who always said that you never admit that you were wrong or were defeated. Always declare victory, and NEVER, EVER apologize.
HitlerPig lives by that, and his followers have adopted it as well.
It's worked for ABC and CBS, why not CNN? Just threaten to pull their broadcast licenses, and accept a settlement bribe.
I suspect CNN won't be the last.