< I am confuse about a thing I read recently
Shitty people often have parts of their personhood which are genuine and capable of being appreciated by everyone. Of course, a shitty person who is an artist isn't going to generally limit their art to reflecting these pieces of their soul. It happens somewhat frequently, though, that the core of a work is decent, even if the shitty author's shittiness are present somewhere in the periphery. However, a piece of art should be judged on its own merits and not necessarily with the author.
I agree, and also the standards for shittiness today are set quite low. There have been (and still are) truly shitty people, even monsters, but the most common case is simply that of a flawed human being. Which we all are.