I'd be very certain to check with local laws. And just because someone doesn't see you doing something wrong doesn't mean it isn't wrong.
https://winknews.com/2017/11/20/florida-man-accused-drowning-raccoon/
Definitely sounds like raccoons.
I don't think that any wild animal "kills for sport." They will kill more than they can eat in one sitting, though if they find themselves with an opportunity to do so. It is no different than you going to the grocery store on a Sunday to get food for the...