The main goal of a shepard, is to keep the flock as safe as possible. The loss of just a single sheep, could be devastating to a flock, and a shepards financial well being. Every sheep is valuable, from a monetary stanpoint, and future strength of the flock. A shepards diligence, is constant. A shepard is always aware of a straying sheep, or if there are predatory wolves threatening the flock. David was a young shepard boy, and his diligence was proven by his use of the rock, and sling. His constantly, slinging rocks at wolves, to keep his flock safe, honed his skills. His practice, allowed him to accurately sling a rock, from a great distance, right between Goliaths eyes. Modern day shepards still, in many countries, apply this method to keep their sheep safe.
Todays "Elders", compare themselves to shepards. They are the shepards of the "flock". In charge of the protection, and spiritual well being of the congregation, their "sheep". As a shepard, each sheep should be valuable and worthy of diligent protection, from the "wolves" of the world.
Could any of us imagine a shepard actually "throwing" a sheep to the wolves. Of course not, this would go against everything we know about how a shepards main role is to "protect" the flock.
What if a sheep within a shepards flock, started to wander slightly outside the "protected" area. Maybe for some food, or simply getting lost, or wandering to far, for whatever reason. Would the shepard, after observing some sheep straying, simply kick these sheep further into danger. Would that shepard, literally THROW THOSE SHEEP TO THE WOLVES, simply for making an "error" of judgement, or getting lost? Of course not, that would be STUPID, in fact it would go against EVERYTHING it means to be a shepard. If the shepard did this, eventually it could have no more sheep, less and less would maybe even trust in the protection of that shepard. The shepards would eventually lose their flock.
So why would the Elders, the shepards of the flock, disfellowship someone, and essentially cut them off from the safety of the flock. How could a sheep survive, if when they "strayed" ,for whatever reason, they were "thrown to the wolves". When you DF someone, by the teachings of the organization themselves, you would be cutting them off from the "safety" of the shepards. In so many words, you are playing with their very lives, judging them to wander with the wolves.
Todays, trigger happy, disfellowshipping, judgmental Elders, are the exact OPPOSITE, of a good shepard. They, truly, make the worst possible type of shepard, as they are possible killers of their own flock.
Remember, "to those more is given, more is expected". Words that may bite them in their asses in the future.