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They don't. Most rabbits are perfectly contented to have a cage to themselves. From what I have heard and read, the rabbits that savage any animal that enters their space are normal, the ones that are "bonded" are an unnatural product of our recent interest in making cuddly pets of them. The domestic rabbit's wild relatives may sometimes live in groups, but they are still fiercely posessive of their individual space (their burrows), and will attack any rabbit that enters it. There are no friends among the wild rabbits, they generally live short, brutal lives. We want our bunnies to be sociable with us, so we are creating a sociability where none existed before. If I can keep rabbits together for extended periods, I consider myself lucky, but I don't count on it.
I once had a litter of 5 bucks that was born to a Jersey Wooly doe. I weaned them by removing the doe, leaving the boys together in their 2' x 4' "home" cage. They were squabbling a bit amongst themselves, but I didn't take it too seriously. I should have. By the time they were 10 weeks old, the most dominant one had mutilated the others to the point that I had to sell them all as snake food. This was the most extreme case, but I have had many animals, both bucks and does, that had to be caged by themselves once they reached puberty.
Some animals may continue with the juvenile behavior of sociability as adults, but many do not.
I thought that the buck would kill the babies if he was still in with them. Is that not true?
I can't say about every buck, but I can tell you what I've observed. I have done some "colony breeding" with older rabbits on occasion, and haven't always gotten the bucks out before the babies began arriving. I have never seen a buck show any interest in the babies at all, of any kind. I have seen him pursue the newly kindled doe with obsessive vigor, and I have seen the doe running, and stomping, and jumping in and out of her box, as the buck chased her. I have also seen multiple does trying to use the same nest box, and seen babies dug out of the box and scattered around the cage by another doe preparing to kindle. I suspect that the buck is getting blamed for damage that is actually being done by does.
I have also had to wean 4 1/2 week old litters because their mothers kindled a second litter after one of these fiascos. My advice to anyone who wants to do colony breeding, is to keep very good records, and separate them before they kindle. Convenience isn't the only reason that most rabbit breeders keep rabbits in individual cages!