If the lives of my wife or children are in danger I am willing to act with great violence secure in the morality of my action and willing to let the legal and social consequences be what they may. I believe, in every instance I would act, that the law is on my side but frankly it is a secondary concern.
My three year old used to have violent fits and temper tantrums. She is also mostly non-verbal and her words at that time included "no" and "stop." When these happened in a store or restaurant the only choice was for myself or my wife to carry her out of the store to the van. I recall in at least one situation noting that walking out with her doing this, with no diaper bag with me, it probably did not look right. I am as concerned about the individuals carrying who are so certain that they are the "sheep dogs" as I am about the "wolves" because at least with the "wolves" I assume they are looking for an easy target which I make conscious action to not present as. Those who convinced themselves that they are "sheepdogs" like misread those actions as marking me as a "wolf." Those that act, convinced in the moral superiority and righteousness of their actions, as "sheep dogs" are likely to do as much damage as any wolf could.
They are also, from a political standpoint, more likely to damage the cause of gun rights. Society assigns roles to individuals and even those with assigned roles have been under attack lately about the use of violent force - see nearly every mass reported police shooting.
Let's take the case of Mr. Zimmerman and Mr. Martin as a case study. Mr. Zimmerman was acting within the legal guidelines if one accepts the outcome of the court case. One could even argue that, as a member of the community watch, he was acting in accordance with the role his community had asked him to. Still the outcome should not be entirely surprising. He intervened, or simply followed who he deemed a suspicious individual. His "suspect," perhaps realizing he was being followed, reacted. We know how it ended and many of us wonder exactly what happened between Mr. Martin and Mr. Zimmerman. Still he was within the confines of the law and acted, it seems, as that "sheep dog." Do you think Mr. Zimmerman is comfortable going into the grocery store at night? You do notice that more than one person demands "justice"? I wonder, if in quiet reflection, Mr. Zimmerman does not wish he had called the police. I wonder if the outcome would have been different had those following Mr. Martin been uniformed or trained as police officers.
Those of you who wish to be sheepdogs may. Be assured that, if I perceive a violent threat against my children, I and many others like me are unlikely to care about the difference between a "sheepdog" and a "wolf".