I have a bunny and he is neutered. I don't think I could have it any other way, unfortunately. I don't see the need for cats and dogs, but rabbits are INCREDIBLY territorial and aggressive with their hormones. Both males and females. They will spray/mark the house, become very protective of their area or parts of the house (lunging, biting, grunting, stomping) and make it difficult to go to those places, and hump everything (including full ejaculation on said objects/animals/people).
One might argue that we shouldn't have them as pets if that's necessary, and I guess from a paleo perspective this could be true. But, we love our bunny, and I wouldn't give him up for the world. I can at least rest easy knowing that I feed him a species-appropriate diet. No processed foods like rabbit pellets - only fresh, organic vegetables, herbs, and fruits. This is the equivalent of feeding cats and dogs raw meat, bones, and organs instead of kibble. So, I can attest that we provide the best of the best for him. Besides, we adopted him as an already neutered male, so it wasn't exactly something we did.
I do think that it's silly to spay/neuter animals if there isn't a reason. I'm sure all of us would miss our reproductive organs, and we definitely wouldn't like having to give them up against our will. But, I'm not sure what other option there is when you have both male and females of the same species living in your house, so there's that ...
P.S. I have to agree with TD (even if that was posted years ago) about not being allowed to have a pet if you won't feed it right. I can't even tell you how many times I want to explode because I'm watching someone feed their dog absolute shit. The most recent ones were: a multi-grain bagel to a beautiful pure-bred malamute (such a shame), and a rice crispy treat to their golden retriever / samoyed mix. It's heartbreaking really. Most of the time if you mention feeding a species-appropriate diet, they say something about not having the time or money to do that. Well, I think the bottom line is: If you don't have the time or money to feed your pet right, don't have the pet. I doubt that excuse would work if your human child died of starvation or malnutrition.