As a teacher I have had multiple issues with kids f*$%king with my cars over the years: knife through plastic rear screen of MX5, coke poured all over Porsche paintwork, tyre slashed on Transit van. All happened on school properties. All happened directly after behaviour incidents in class.
So far, nothing has happened to the bike (don't even lock it). Possibly due to it being parked next to the bikes owned by the caretakers (ex army tattooed and both well over 6 foot.....Pan European and Triumph Rocket). Thats the beauty of living remote I guess. When in London (all my life till 40 years old), I would daily have to stop people trying to knick my scooters/trials bikes, or sitting all over my cars.
I'm not suggesting anything, just reminiscing.....