hate bait

 this is a poster in a new york city subway created and paid for by the same folks responsible for the 'cartoon mohammed' contest in texas that got 1 man wounded and 2 men killed (they call themselves the 'american freedom  defense initiative' - officially classified as a hate group by the southern poverty law center).

if it's against the law to shout 'fire' in a movie theater, why isn't hate speech that is designed to cause violence and even murder illegal, too?