Alley Cat Allies forgets that he or she doesn't know me, or the opposition I (please forgive me for not adding "and others". I was thinking under pressure.) am rallying to do away with TNR. It will take the average American becoming disgusted with the sheer number of cats to provoke them to action, but that point is soon coming. The millions of cats abandoned recently because of the financial circumstances could become the catalyst. Sort of like the humidity reaching saturation point, before raining on your parade.
The tiny percentage of pets you sterilize is ineffectual, as everyone besides you knows, or will know as we educate them, and you enable their killing of our fauna.
Speaking of education, your rhetoric is showing when you resort to quoting the mythical vacuum effect, it is a fallacy. When one feral cat or a million is removed our natural fauna can move back into what is rightfully theirs.