The reason I don't plan on firing "warning shots" is simple.
I carry a gun to defend my life. That gun stays concealed until I make the quick determination that my life is in jeopardy. When my life is in jeopardy, "warning shots" are neither desirable, nor necessary. In fact, "warning shots" seriously deplete my ammunition, making it less likely that I will sucessfully defend my life. "Warning shots" rely on criminal conversion to work. They depend on the intelligence, fear, and benevolence of an attacker who is demonstrating none of those traits. If the appearance of a firearm does not change the dynamics of the encounter, it is highly unlikely a bit of noise will either.
To me, a carry gun is more than a noisemaker. To me, defending one's life is more than a series of attempts to see what will work. Facing imminent death is different from facing a computer screen, or winning an argument through a series of escalations towards violence. When another person is intent on killing you, the stakes are very high, and the odds are already against your survival. He has the initiative, and you are in defensive mode. Unless you turn that around, you will die. Shooting lead in the ground at your feet doesn't change those facts one bit.
Others may believe differently. That is their perogative. There are some of us who will die because of our decisions and beliefs regarding our carry guns. Thus, it is imperative that each person make up his own mind. I post my beliefs here simply for others to consider, not as dogma to be followed blindly. I do not like absolutes either. I do, however, believe in having a few precepts to guide me, with the freedom to abandon them as required by the situation at hand.
FWIW, I would like to commend the participants of this thread for staying on the high road.