Artists, writers and thinkers whose works have endured and had lasting, powerful cultural influence were almost by definition nonconformist and envelope-pushing in their own time, which tends to make one the subject of lots of nasty rumors and allegations, regardless of what the reality is. Plato's mentor Socrates was convicted for corrupting the youth by turning them against the gods of Athens; Thomas Aquinas wound up getting some of his followers--and quite possibly himself, though that's not clear--excommunicated for heresy; Shakespeare could never have won the hand of a respectable wealthy man's daughter in his day because he lived and worked in London's theater district, which 'proper' people considered a cesspool of debauchery, except of course when they felt like catching a boat across the Thames for a little entertainment themselves. Etc., etc., etc. Regardless of whether particular reverence for some great artist, writer or thinker tends to be stereotypically associated with being'moral''conservative' today (since you seem to be treating the two as synonymous here), it's generally unlikely s/he was credited with being an exemplar of high ethical standards at the time.
Honestly, purpleoscar's posts in this thread make me think that his main issue with art is that he perceives artists to be leftist-leaning immoral freeloaders.