Crisis on Infinite Earths: Part One - S5-E9
Continuity mistake: Oliver still has a quiver full of arrows when he's making his stand at the end. A shadow demon knocks him down and all of the arrows disappear instantly. They've not been knocked out of the quiver onto the ground, they've disappeared entirely.
Answer: Lucas has gone on record as to the treatment of droids in Star Wars being a thought-provoking allegory for the way people treat minorities. I've never heard him specifically talk about how it's almost never commented-upon in-universe, but intentionally or not, I'm of the opinion that it's more compelling this way. Why doesn't anybody do anything about the way droids are treated? Well, go around asking people why they don't do anything about the way other people are treated and you'll quickly find out.
TonyPH