Yea, they sure worry about that turtle, disease, domestication and interbreeding thing with the wild horses.
The error you're making is assuming that sarcasm can be nonsensical.
I would expect that the concerns about unvaccinated feral cattle that have never before been handled are valid. Likewise just a few generations of feral outcrossing in hogs can undo years of careful selection. I imagine its not to hard to create scrub cattle under feral conditions.
