I'd be worried about diseases. Raccoon feces carry quite a few diseases including some that can be transmitted to humans and pets. One of the nastiest is Raccoon Roundworm. It can become potentially fatal for very young or elderly people. The worms can migrate throughout the body and cause blindness, liver enlargement and coma. Rabies can be transmitted through the feces and they can carry viral canine distemper. They also carry leptospirosis, which is a nasty bacteria and salmonella.
All in all, they don't make good pets and it's not a good idea, no matter how cute it seems, to have a wild raccoon near pets. If it had been a full grown raccoon, it probably would have taken off with the kitten and made a meal of it.
