It may not be a "nice" idea breeding buns for meat, but i honestly don't see a difference from breeding cows for meat. As long as the rabbit's conditions are well-maintained, & they are all healthy & content i don't see anything can be done. If they aren't well cared for, I wouldn't hesitate to report it.
(I am a vegetarian - I also work on a farm where cows are bred for meat, & I have a New Zealand white!)