Not that it has anything to do with Wikipedia, -- you're right that you might get arrested, but in the US the arrest may not go well for the arrester: See Cohen

Not that it has anything to do with Wikipedia, -- you're right that you might get arrested, but in the US the arrest may not go well for the arrester: See Cohen v. California (1971) (or something more recent: Thurairajah v. Arkansas). In this case a closer analog would be someone saying "Fuck you" to a judge in court (arbcom), and then the property manager of the courthouse comes (WMF) unbiden by the court and evicts that person from the property and declines to provide any detailed explanation for their actions either to the public or the court. It might well be that the judge would have eventually found the party in contempt and no one would have had an issue with it... but as it is the public is left confused and concerned about the property manager's use of their right to prevent trespass effectively undermining the authority of the established system of governance.