They probably forgot to allow for the graft and corruption that is endemic in government.
When I owned a home in Anaheim,CA. the city required us to sort our recyclables into a separate can, the city supposedly would make profit on this and help keep rate hikes down. The end result? The lowlife scavengers were really happy that it made it easier for them to get the goodies, and the city did not one thing to stop them from taking the recyclables.