I think the issue isn't family farms, most small farmers take their job seriously. The issue is big conglomerate farms that don't want their industrial processes to be aired and criticized, much less have people discover practices that produce tainted and diseased products that might kill people. It's easier to control the fallout when things go bad when there are no pictures, such as in lawsuits.
My background, I am from Idaho, my father, brother, and brother-in-law are all dairymen, and I worked my dad's dairy for 15 years. I also know the guy who owns the dairy the film was taken on, and I know quite a few of the people performing the most ageegious acts were fired soon after it was published. But, as an issue, the film was just published, in the most sensational way they could, and NO effort was made to co…
If you're interested in fixing the image of dairy farmers in Idaho it's probably not a good idea to ban filming on farms. Doing so just makes people assume the worst is happening. If, as you seem to argue, the conditions are not all that terrible, then why not open all diary farms to filming?
I also don't understand why the publisher should have contacted the dairyman beforehand. What purpose would that serve if the video would eventually be published anyway?
People care about where their food comes from now a days, and you're right that the public is ignorant of dairy techniques. However, you can't complain about the public's ignorance of dairy farming while at the same time decrying a publisher for making a move about dairy techniques. Censorship is not an effective means of education. If the dairymen want the public to be better educated then they should open their farms up, or start making their own movies detailing how they raise cows.