Joe Biden (and to be honest most Dems and all DC beltway types) still cleave to 1980’s political norms. So when a “scandal” breaks, its all “OH MY! HEADS MUST ROLL!”
Whereas Republicans operate on 2020 political norms. So when a “scandal” breaks (up to and including scandalously trying to overthrow the republic) they say “LOL. Nothing matters! Fuck You.” And presto! No scandal.
I know many Dems, even commenters here, feel good about themselves and believe that they are destine to live eternity in heaven because they have the right norms. That’s comforting, I suppose.