If you follow the chain… We brought the cats. By saying they did not know better and we do know better, We should have known about how invasive species can dominate ecosystems and wreck everything around them. In fact, In Pennsylvania, they have to kill Spotted Lantern flies(from asian flights) because the spotted lantern flies would eat all the plants that native animals depend on. This is why food is inspected on flights(the risk of foreign diseases/parasites). The native species on their land did not adapt to foreign predators. We did not know better(like the cats) and now we do.