Ban any cutlery from your home and make your son eat with his fingers. If he asks why, remind him of the youth who stabbed a cat to death last week with a fork. Explain that if just one cat is saved by the banning of cutlery, then this prohibition will be justified. If he protests, question him closely about why he is intending to kill innocent cats, or accuse him of being a cat hater.
I love it!