Imagine I own a bunch of billboards around town. A customer comes to me with cash and wants to display someone's personal details and a message encouraging hara

Imagine I own a bunch of billboards around town. A customer comes to me with cash and wants to display someone's personal details and a message encouraging harassment on my billboards. Do I have to wait for law enforcement to stop me from displaying their content? Or can I, as a private company, make a judgement call and decline their business? I think the answer here is pretty obvious and your attempt at passing the buck is pathetically weak.