> People arguing that would be happy if no animals were farmed at all.

This. It's a propaganda angle to try to get non-activists to support their group's demands by adding a spin to their claims that makes it more engaging.

The same blend of propaganda also includes things like showing a picture of a pig showing only its eyes, devised to underline their similarities with human eyes. They then proceed to draw a parallel between slaughtering pigs and humans. Another take is portraying cattle as pets, and you wouldn't kill your own pets now would you?

In the end it's just propaganda to try to convince non-militants to unwittingly support a cause. It doesn't matter if it's arbitrary or outlandish. The goal is to sway you to do the militant's bidding.