How many times have you had to clean up after the raccoons, or been woken up by their drum solos. Rats and mice are annoying, dirty, unwanted guests.
Bats can make a lot of racket with their nocturnal parties.
Skunks can, well, skunks are just smelly. All these animals come looking for food and shelter. The dropped food is an easy buffet for raccoons and other prowling creatures. Another source of food is garbage. If you have some particularly clever raccoons, this might not stop them.