 Why was Infield opposed to a world comprised completely of the Cured?
Henry Infield placed the insulated circlet on his head gently. The gleaming rod extended above his head about a foot, the wires from it leading down into his collar, along his spine and finally out his pants leg to a short metallic strap that dragged on the floor. Infield turned his soft blue eyes to the black and tan oxfords with the very thick rubber soles. The people we treat are on one side of the line and we're on the other. How can we really understand the people who come to us, if we hide on our side of the wall?" "I dunno, Henry, but staying on our side is a pretty good way to keep sane The whole world is going mad and we are just sitting back watching it hike along. Do you know that what we are doing is really the most primitive medicine in the world? We are treating the symptoms and not the disease. One cannibal walking another with sleeping sickness doesn't cure anything. Eventually the savage dies—just as all those sick savages out in the street will die unless we can cure the disease, not only the indications." But now I know we're semi-mechanics, semi-engineers, semi-inventors, semi lots of other things, but certainly not even semi-psychiatrists. A psychiatrist wouldn't give a foetic gyro to a man with claustrophobia." His mind went back to the first gyro ball he had ever issued; the remembrance of his pride in the thing sickened him. Floating before him in memory was the vertical hoop and the horizontal hoop, both of shining steel-impervium alloy. Transfixed in the twin circles was the face of the patient, slack with smiles and sweat. The gyro actually passed over a man's shoulder, through his legs, under his arms. Any time he felt the walls creeping in to crush him, he could withdraw his head and limbs into the circle and feel safe. The foetic gyro ball was worn day and night, for life.
 He felt it was a slippery slope that would lead to the need for more and more Cures and, ultimately, a general lack of independence.
 He was completely against the genocidal notions of Georgie in reference to his solution for handling the Incompletes.  As one of the Normals, Infield had an interest in maintaining a society that balanced those who had Cures with those who did not.  The Cures gave the individuals who had them abilities almost like superpowers, and Infield worried that a demagogue like Georgie would harness them for his own rise to power.  He felt it was a slippery slope that would lead to the need for more and more Cures and, ultimately, a general lack of independence.