Syn, have you ever tried taming an adult feral cat? Believe me, you don't know the meaning of the word "aggressive". I had to handle Bumper wearing welding gloves and high rubber boots.
Getting vasectomies and retaining all the adult feline aggressive, territorial behavior would just result in lots more kitties being gassed to death in shelters because most humans would not put up with being lacerated and bitten five times a day. There are millions now that are put to death every year simply because no one wants them. Better to give them a good life than no life.
Believe me, cats, horses, cattle, etc. do not have the human hangups about being "men". They don't strut their "macho" stuff all over the place. Actually, that's giving me an idea..... Naw, they wouldn't go for it. (hehehe)