I don't think the value of a person's art or the level of their skill is determined by their morality. Flowers can grow from crap. We are all different mixes of good and evil. The worst and best of us are still human.
The troubled singer/songwriter Jimmy Donley (1929-1963), who committed suicide in 1963, was a mix of good and evil. The Mississippi born Donley was dishonorably discharged from the Army in the late forties/early fifties because of his racism towards a Black NCO. Think about how racist you had to be to kicked out of the Army in the mid 20th century! Nevertheless Donley later became good friends with Black rock-n-roll icon Fats Domino, occasionally writing for and singing with Domino in integrated bands.