We all know that rights are limited, even the 2A.
I always laugh when I hear the Soviet-Pravda standard excuse ("everybody knows that...."). It occurs most often when the perpetrator knows his statements are false, that he can't defend them, and that people who believe them are in the minority.
You want me to back this up?
First Amendment exceptions.
Shouting "fire" in a crowded theater, known as the "clear and present danger" ruling from Schenck v. US (1919)
False statement of facts from the ruling in Gertz v. Robert Welch, inc (1974)
Obscenity from Miller v. California (1973)
Child pornography from New York v. Ferber (1982)
Offensive speech from Chaplinsky v. New Hampshire (1942)
Speech owned by others from Harper & Row v. Nation Enterprises (1985)
Religious practices that are crimes from Reynolds v. US (1879)
Limitations on the press during war time from Schenck v. US (1919) and Brandenburg v. Ohio (1969)
Espionage in relation to Bradley Manning (and I would assume people like Assange if he ever makes it out of the Ecuadorian embassy.)
The Third Amendment has never been part of a Supreme Court case.
Fourth Amendment exceptions.
Open fields etc may be searched without a warrant from Hester v. US (1924)
Where obtaining a warrant is dangerous or impractical
Searching people arrested without a warrant from Weeks v. US (1914)
Searching vehicles the police suspect of having contraband without a warrant from Carroll v. US (1925)
Searches at borders without a warrant
Oh, I could go on all day. There are exceptions for all rights.