LOL none of my intact male Pit Bulls have ever tried to bite anyone, let alone maul them. Just because someone choses not to s/n doesn't make them irresponsible. My dogs are not likely to become aggressive, man biters, dangerous, ect because they are bred properly, socialized to people and it is in their nature to be friendly to everyone they meet.
I agree and disagree with you. It all depends on which dogs you keep intact. I have show dogs and pets. (All my dogs are companions first, but you know the difference I'm talking about.) ALL my "pets" are spayed/neutered. There is absolutely no reason for them to be intact. Having them spayed/neutered eliminates the chance of unwanted litters and prevents certain kinds of cancer in both sexes. In females you also don't have to bother with heat cycles. My show dogs are not spayed/neutered for obvious reasons. As soon as the dog is done showing/breeding it will be altered. No reason for them to be intact.

I strongly believe that unless the dog is actively showing/breeding it should be altered. All this crap you hear from people saying how "the dog wouldn't be a male without his balls!" or "I couldn't put my baby through surgery!" I see it as if your dog needs to keep intact to show Masculinity the owner has some sort of problem with their own Masculinity. If you can't put your poor baby through surgery just go ahead and run that risk of the dog getting pregnant and needing a c-section. That is a MUCH more dangerous surgery than a simple altering.