You don’t get it. Suppose you spent years to make a documentary that supported your politics. And suppose, once you released it that someone who disagreed with your politics took your film which you have released and are entitled to the earnings from the sale, and he edited it to the point where it supported his politics and he sold it and made money off it.
What would you do?
The films are owned and copyrighted, the owners are the ones that decide how it can be sold, nor profit from the sale. No one else is allowed that right without approval from the owners. You are not on the side of the law here.
Actually, parody is protected use. Provided he wasn’t making money off selling the discs, fire away.