Sick and home today. Love the "social dilemmas" segment every week and always enjoy your take on how to solve. Regarding the cat on the porch: maybe put some moth balls somewhere that the cat can't eat them (I seriously doubt the cat would try, but be safe) but can definitely smell them. Moth balls get rid of rabbits that destroy flowerbeds and I bet they'd get that cat to choose another spot.
Have a great day!