I include this partly in contrast to Samsara (below).
Whereas Samsara is beautifully filmed and provides no commentary, Earthlings is about the slaughter of non-humans by humans in ways we would consider cruel and inhumane (including in so-called "kosher" facilities). The narrator provides a point of view.
The film looks at animals as pets, sources of food and clothing, entertainment, scientific knowledge.
Earthlings feeds a sense of misanthropy (hatred of humans).
Mark Twain: of all of God's creatures, Man is the most detestable. Yes, that's obvious. Many angels think so too.
Misanthropy is probably too simplistic a response though.
In a reincarnation system, we might suppose humans return as the animals they kill. That would be called "poetic justice" by many. However, the sum total is just a lot of meaningless suffering, however it goes down.
Hatred of existence itself is another meditation one might practice, perhaps as a stage along some path. Life is an ongoing holocaust, 24/7/365. Are you part of the problem (adding to the net total suffering) or part of the solution (decreasing to the net total suffering)?
If you suffer a lot yourself, that doesn't necessarily help matters, but perhaps you can't help it. We're just little humans and Universe is really big. Victimhood seems a natural condition and humans have often cast themselves in this way, against a greater cosmic backdrop.
LCDs in schools of philosophy might be more likely to screen such content than religious schools, although in some cultures that distinction is not made.