Should there ever be limits to the "Freedom of Speech"? Why?

Like as in burning your flag? Yes there should be a limit to destroying national treasures. If you don't like America get the hell out! Thats what I say... Secondly thats not a freedom of speech thats just destruction and disrespect. As long as your speech is peaceful as far as public marches etc then no you should be able to picket and speak your mind. Just do it appopriately but that goes without saying.