The narcissistic fuckwits who graffiti their names on culturally significant landmarks/monuments should be held down and have a picture of the monument forcibly tattooed on them. The location of the tattoo should depend on how prominent the writing on the monument appears.
(Not really, but it's infuriating to see some centuries-old building or sculpture covered in a mess of overlapping scribbles.)
“If you hate a person, you hate something in him that is part of yourself. What isn't part of ourselves doesn't disturb us.” - Hermann Hesse