A Word about "Compulsion"

From Chapter 2 of Clicker Training for Obedience. Many trainers who dip their toes into the waters of operant conditioning still reserve for themselves the option of "making" the dog do an exercise at some point in the training process. The theory, expressed in different ways, boils down to the notion that "the dog must know that it doesn't have any choice but to obey when I give a command." In response, I pose two questions: