As usual, you can always be counted on for a nice, thoughtful response.
Here are some comments on some of your points.
When you say that our current society seems to think that aminals should breed just because they can - I think you're wrong. I feel the vast majority of people in our society feel all animals should only breed when it serves the purpose of man.
When you say that you have little faith in the human race's ability to be responsible with an unaltered dog ( or any animal) I might agree with your assessment (I don't, but I might) but I CERTAINLY disagree with the idea of force neutering as the solution. Why take out your lack of faith on the animal? Castration and hysterectomy have consequences and wouldn't you agree that they should only be performed if they're in the best interest of the animal?
As far as your male being testy around other dogs - I have 2 thoughts - NEITHER - mean to be critical.
1- Many people OVER REACT to dogs being testy with each other. And many people, due to their lack of courage, can't step up to the plate and physically make it plain to the dogs that it won't be tolerated. I understand & sympathize with this problem. This leads me to my second point about male on male testiness:
2- Some breeds, as an average, are VERY low on the dog to dog agression index. I believe people who are CONCERNED about their males being spunky with other males ought to think very long and hard BEFORE getting a breed that isn't one of these low aggressive dogs. The dog shouldn't pay the price of castration because a dog breed is ill matched to an owner.
As far as your point about all the possible negative effects of neutering for a dog are worth it if it makes the quality of life in a family 1% better - I believe that to be an exaggeration on your part and you're only trying to make the point that allowing the dog to pay the price of de-sexing will often result in said dog - being allowed to remain in a family who would otherwise discard it for convenience sake.
Poor dog, to be part of such a miserable crew!
Finally, here is a another interesting link.
Link