Should we neuter dogs - animal rights issue? People have had dogs for thousands of years. The practice of neutering them only started in the 30's and really only became commonplace in the 70s because millions of stray dogs were being euthanized. There are other ways to control a dog other than cutting off its balls. If it is properly trained and sees you as above it in the pack, much of the sexually aggressive behavior will not be a problem. For example, when feeding it, you never let it eat first as the order in which it eats signals to the dog what its status is. It must be constantly reinforced that its status is the lowest member of the pack.
You said that from a dogs perspective, it's better off having its balls cut off because the owner is not able to deal with their sexually aggressive behavior. So it really is about what's best for the owner again, not the dog.
I will concede though that in some cases, you might be right. Neutering might be the best and only option but it should not be the default option for all dogs.