Earlier quoted context omitted.
Seems totally fair to me. Don't loan your games to people you can't vouch for. It creates and preserves a circle of accountability. Similarly how you wouldn't loan your car to a friend who doesn't have insurance. If you do it it's on you if he bins it.
Pretty much every single child thinks cheats are the greatest things ever when they first discover them. Usually you discover how boring and easy they make the game fairly soon after, but you still try them out.
The tf2 cheaters have been at it for several years.