Because in our Society we are split up into 3 catagories.
Sheep (those that live in denial and refuse to believe that the threat from the Wolf is real until it is too late. Sheep attack Sheepdogs for being like a Wolf, but they forget that the Sheepdog, while having fangs like the Wolf, would never hurt the sheep and protect the sheep at all cost.)
Wolves (Those that wish to do harm to the sheep and sheepdogs. Wolves would be the criminals, terrorists, and other violent people with no regard for human life.)
and
Sheepdogs (Those people that stand on a fence, walk a beat, or put themselves in harms way to say, "Not on my Watch!" and will do everything including laying down thier own life to protect the flock. You don't have to be a person in uniform to be a sheepdog. You only need to be a common citizen that decides to stand up to the Wolves.)
I choose to be a Sheepdog
Everyone should read this -
http://mwkworks.com/onsheepwolvesandsheepdogs.html