Cat’s natural instinct is to be playful. They are hunters. Cats are better off remaining indoors as they are natural hunters and they will compete with other animals to prey on smaller animals which damages the local ecosystem.
Outside cats are not only predators but they are also competitors. Local wild predators such as foxes, skunks, raccoons, opossums, weasels, coyotes, bobcats, hawks, and owls rely on the native populations of prey animals to survive.
For more information on the predatory behaviours of cats check out this article: – The Moral Cost of Cats