Maybe you've never been any where with feral animals that descend from domestic animals. My grandpa used to have an issue with feral cats that used to be someones outdoor cats then they ran off mated with someone else' "outdoor" cat and bam. He actually shot them on sight since they would attack you if you approached them. They killed everything all the song birds etc. not just chipmunks. This happened in Illinois. Just saying that its a real issue I know we in the suburbs don't feel the impact of it since nature is a novelty. If we didn't have the ANIMAL shelters picking up and putting down animals like clockwork I expect we'd have more of an issue with this But instead of banning pets we built up a whole entitlement program around certain ones

Just ask animal control if all cats/dogs are created equal. If we had a whole industry built up around fish keeping and waterway upkeep like we do cats and dogs we would be having this discussion. The fish equivalent isn't 1/10 the size.