It was probably down-voted because it asserts the fallacy that bullets are some sort of acceptable substitute for pepper spray. We'd rather have neither.

Non-lethal weapons are a hotly debated topic in the area of civil liberties. When you start looking in to the effects of non-lethal weapons on police behavior [1], the root of the issue becomes more clear. The two decision paths stemming from the question of "Should I shoot this person, likely resulting in the end of their life?" are much more clearly deliniated than when the weapon is non-lethal.

1 - http://www.google.com/search?q=effects+of+non-lethal+weapons...