A person's personal life does not immediately invalidate their work.
For example. Let's say the accusations about Leonardo Davinci's predilections for corpses were true... they aren't but let's say they were.
Would that devalue the Mona Lisa?
Humans are monsters, each and every one of us.
Occassionally we still make art despite that
@TheGibson The Mona Lisa is a deeply established cultural icon now. There's very little we could learn about da Vinci that would make us remove it from its prominent spot. There'd maybe be a bunch of signs contextualizing it or something, but it would stay.
It's easier for more recent artists with less "cultural centrality" to overshadow their own works. (No matter how good those works are to someone without knowledge of the scandal.)