Haven't yet watched the videos yet but can comment on "The Bulletproof Mind" which is a series presented by Lt. Col. Dave Grossman (retired) and his points are extremely well-articulated and well-researched. He too uses, and perhaps coined the idea of "sheepdogs." Frankly, I too agree that there's nothing wrong with being of the mind that we're all in the same game together, to have a peaceable, co-existence on this planet and to share in the obligation to one another the duties and responsibilities of maintaining that peace and co-existence by dealing with the ugliness in the world that seeks to disrupt that.
I'm not intending to flame anyone with my remarks, but I feel the mockery or jest derived from this line of thinking, as "extreme" or "over the top" as it might appear, is frankly brought on by a cultural bias in the societies we live in that has demonized the idea that we can provide and control our own means to self-defense, and the defense of other innocent life. As has been pointed out in this thread, to think that you're only responsible to yourself in a society, is greedy, and selfish. Wikipedia (doesn't really matter who I cite, the gist is always the same) defines society as "a group of people involved with each other through persistent relations, or a large social grouping sharing the same geographical or social territory, subject to the same political authority and dominant cultural expectations". As a person living within a society, I cannot assume that my actions will not impact another individual, and were I to act negligently, I would expect my peers within that society to hold me accountable for that negligence. Just the same, I feel that there is merit in providing for a defense of our society and the individuals that comprise it through shared responsibility to protect one another, using whatever term you'd prefer to attach to that responsibility. As Mr. Grossman had said in his presentation, if some atrocity were to unfold, and you aren't prepared to stop it and have to watch it unfold helplessly, your future is a very grim one, no matter the outcome.