Why has the gruesome practice of chopping a male dogs' balls off become acceptable in society?

Man, people are SICK. Let the poor dogs keep their damn balls.

Because of this - http://www.shelterrescueinc.org/id6.html

Not only does neutering reduce the occurence of unwanted litters but it provides countless health benefits to male dogs as well.Eliminated chance of testicular cancer, reduced chance of prostate cancer and hernias. It also lessons the instinct to roam, thus reducing the chance your dog will run away to mate.