I love the "Marshall has freedom of speech to say whatever he wants" comments. Most people genuinely don't seem to understand what freedom of speech is, and that it only protects you from being charged with a crime.
Sure, Henderson has every legal right to say whatever stupid garbage he wants to say without being thrown in jail- just like Hugh Kellenberger and everyone else has every legal right to call him a dumbass for saying it.
ETA: And yes, it looks like Kellenberger thoroughly enjoyed writing that article.