I have mixed feelings about Mills' position. I partially agree with him and partially don't. Animals should have the right to privacy, just as they should have a host of other rights that are systematically denied to them by human beings. He won't get much of an argument from me on that point. But wildlife documentaries serve an important function. To the degree that we empathize with animals, often it has to do with these wildlife films we've watched at various points in our lives that help us to understand the behavior and lives of animals. Moreover, with all the ghastly things being done to animals in the world today on a mass scale - within the walls of the factory farm system, by the fur and leather industries, by animal abusers, by large fish farming enterprises, etc. - the act of simply filming animals seems downright innocuous by comparison.
When the majority human beings reach a stage in their development that they empathize with all animals (not just dogs and cats) on a deeper level - or maybe I should say, if human beings reach that stage - then we can talk about whether we want to cease making these types of films and enact laws to protect the privacy of animals. But with all of the horrors being committed against animals in the world today, halting the filming of wildlife documentaries ought to be considered a low priority for animal advocates everywhere.