The question becomes, is one judging the work ( of art) or the artist?

All the Greek philosophers lived in slave holding societies.

So would NOTHING created from before, say, 1700 be acceptable? What about 19th century "poor houses"? Are they fundamentally any different from slavery?

IMO one should judge the work without regard to the artist- One thing I dislike is so-called "art" that depends on sympathy for the artist. I have great sympathy for the child dying of cancer, but does that make his/her poetry or crayon drawings any better art?