Nobody does, that's why you can claim you didn't know. The law has to respect what most of society would do. Famously, hockey teams were held liable for people getting injured by flying pucks, despite each ticket to the game having an agreement that if bought the ticket you accepted the risk. But nobody reads the back of the ticket. In the end the arena put up nets to catch the pucks.
Um. Yes. Technically yes. And in several different ways too. I do not necessarily want to assume what you intended to write here. Would you care to elaborate a little? I was going to open with a history of law and how certain level of distance of court from the mob's wishes is desirable for a societal reason, but I decided against it since I might be assuming what you were trying to say.