Cavuto has always been... uh... 'questioning' of Trump as President.
With that said, Barr is simply citing the pragmatic approach in deciding who to support.
When confronted with a binary choice, one tends to go with what they perceive as the lesser complicated.
Unfortunately, I'm afraid many voters won't see things his way and will perceive Biden as less problematic, forgetting the odds of ending up with Kamala at some point.