system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: I am a vampire, and I think that humans can and should be sustainably farmed.

As you know, human blood is required for sustaining our unlife.  (Though some SJWs insist that animal blood is able to do the job as well, they should be discounted for this discussion.)  It is *not* required to kill humans if we don't fully drain them of their blood; they can easily recover from the anemia in just a few weeks with proper care and nutrition.

Using this method, a small herd of 20 or 30 adult humans can provide sufficient food for a single active vampire without killing any of the herd.  Additional humans can be used as breeding stock to help replace those who become sick or too old to contribute to the feeding process.

I know that there are some radicals who object on the grounds that humans are sentient beings who deserve autonomy.  But this is irrelevant.  Humans on ranches already live full and productive lives as our food sources and occasionally as our pets (though I think it is a bad idea to become too attached to a potential meal).
gpt
The problem is that these ranches operate with little regulation or oversight.  While there are certainly some vampires who treat their food source humanely, there have been startling accusations of physical, emotional and sexual abuse of humans.  Since vampires can't be captured on film, it's difficult to prosecute these offenses even when there's clear evidence that crimes have been committed.  There's concern that vampires who engage in sadistic practices with humans could become so desensitized to violence that they attack their own kind.  We were all humans once, after all.

Since many vampires don't have the time or energy to keep their own private blood farm, they end up purchasing most of their blood from shops.  This removes them from the actual realities of farming.  If the blood they're buying is harvested unethically, how will they know?  There are no universally recognized standards for sustainable, humane blood farming.  There are no regulatory inspections of human ranches.  We're all aware by now that "organic" blood is mostly a marketing gimmick, and that so-called "free range" blood is anything but - "sustainable" is likely to be another corporate blood industry lie.

There are ethical concerns involved in farming animal blood as well, of course, but the higher sentience level of humans should be taken in to account.  Involuntary captivity produces significant stress in humans, and there's emerging research suggesting that humans who have been subjected to stressful living conditions have higher blood cortisol levels.  Stressed humans living in overcrowded conditions are also disease-prone, requiring high levels of antibiotics and growth hormones to maintain their health.  Could these issues be contributing to the growing epidemic of vampire obesity?  It's getting to the point where many vampires are too fat to fly, making them easy prey for angry mobs and vampire hunters.