I guess I ought to clarify my position. The line should be drawn well on the side of freedom of expression. Emotive expressions should virtually always be legal. As long as there isn't reason to believe that a thing that someone says is going to lead to a crime being committed, any punishment for that speech is unwarranted. That includes things like "I demand the death of (insert minority here)."

Unless you can convince a jury of that person's peers that that particular expression was going to lead to a particular crime being committed against a particular person (like, if I said "here's a gun, go kill that guy"), that speech should be legally protected.