Yup. If it were up to me, anyone found in the process of spraying grafitti paint would be arrested and dropped into a vat of oil-based paint.
I thought I had posted this on the other thread but I can’t find it. Anyway, from Washington State Law on the use of force:
3) Whenever used by a party about to be injured, or by another lawfully aiding him or her, in preventing or attempting to prevent an offense against his or her person, or a malicious trespass, or other malicious interference with real or personal property lawfully in his or her possession, in case the force is not more than is necessary;
Although I suppose that this latest rulings and perhaps previous rulings have made this law mute.