People don't want to see cynicism and negativity and darkness that mirrors reality in films. they want to be uplifted. Lucas made the same mistake i thought he had learned from THX 1138 dark and social commentary films don't work. the lord of the rings trilogy and the harry potter films have there darker moments but their is an essential humanity to the characters that seems to be absent from the prequels.
(i had to do a double post because the stupid system says i ran out of space)