hidden efficiencies
If the carnivores are preying on urban pests, as these most likely were, then harvesting and utilising them is a way to get return from an otherwise wasted resource, same as village pigs being allowed to forage thru garbage.
In countries where cats have been introduced, they tend to be serious threats to the native species, and feral cats contribute to the near or actual extinction of several species (Dodos being the posterchild).
So in urban areas, cats are a way to transform vermin into cuisine, and in non-urban areas, they are a pest themselves which needs to be controlled.