Airline "why" question #1: baggage.

How come when the bags come down the chute onto the carousel, practically every one of them that has a front and a back (or a top and a bottom) is wrong side up? The bottom or back, without the pockets and other features, is usually not distinctive. They’re much harder to recognize upside down. Also, they’re typically lying on their contoured side instead of their flat side. Why don’t they put them on the conveyor so that they’ll come out right side up?