I think this is how it goes: The people who set things on fire weren't directly associated with Greenpeace. But the argument is that Greenpeace's rhetoric incited them to do so. So it becomes a freedom of speech issue. If you tell people something is evil and must be burned, are you responsible for that thing getting torched?

The Hutus that committed genocide in Rwanda were not directly associated with that radio host that called for murders, yet he's a criminal.