You're right, of course, that DU has the right to choose who publishes in their publications. It is quite clear that DU has made the call that Mr. Kennedy's millions are worth more than DU's own positions statements on hunting. I reference, for your benefit, the "DU Position on the North American Model of Wildlife Conservation and Hunting" and specifically point #7:
Hunting, fishing and trapping shall be democratic. This gives all persons – wealthy and poor, landowner and non-landowner alike – the opportunity to participate. (
http://www.ducks.org/about-du/du-position-on-hunting?poe=homeLink)
The Montana law in question, and in fact the provision of the Montana State Constitution as cited by the Montana Supreme Court in question (both of whom Mr. Kennedy via his attorneys in open arguments in court want overturned for his specific benefit), guarantees the right of access to public waters in the state. There is little more democratic than that.
When a person decides for themselves that democratic and legal access to public waters is against their wishes, they stand against the North American Model of Wildlife Conservation and the stated positions of a myriad of conservation groups, DU included. When a journalist and noted conservationist calls out said person for their actions, that journalist speaks for hunters, anglers, and conservationists across the board. When an organization determines that the journalist rightly speaking out is in the wrong simply because said person called out is "offended" and their "offense" comes with substantial dollars, that organization has put a price on its very soul.
Again, you are right that DU has the right to choose whom to publish and that right clearly has a price tag. As a hunter, angler, and conservationist, I too have a right - one to determine which organizations I support that also support me, the North American Model of Wildlife Conservation, the law, and ethics. Unfortunately, Ducks Unlimited has chosen for themselves to not be one of those organizations. Enjoy the twenty pieces of silver from Mr. Kennedy, as my shekels will go elsewhere.