 Why was Infield opposed to a world comprised completely of the Cured?
Henry Infield placed the insulated circlet on his head gently. 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. "I dunno, Henry, but staying on our side is a pretty good way to keep sane 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. 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." Floating before him in memory was the vertical hoop and the horizontal hoop, both of shining steel-impervium alloy. 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. "You know, Henry, not all of our Cures are so—so—not all are like that. Or suppose he's walking down a railroad track and hears a train whistle—if he can hear anything over that verbal pablum gushing in his ear." But what about the severe case where we have to burn a three-dimensional smiling mother-image on the eyes of the patient with radiation? With that image over everything he sees and with that insidious voice drumming in his head night and day, do you mean to say that man's senses will only be impaired 23 per cent? Why, he'll turn violently schizophrenic sooner or later—and you know it. The only cure we have for that is still a strait jacket, a padded cell or one of those inhuman lobotomies." Infield stepped into the main stream of human traffic and tried to adjust to the second change in the air. He walked along, buffeted by the crowd, carried along in this direction, shoved back in that direction. Many "Cures" were not readily apparent. A young man with black glasses and a radar headset (a photophobe) was unable to keep from being pushed against Infield. He had been one of those condemned Normals, more to be scorned than pitied. Suddenly something else was pushing against Infield, forcing the air from his lungs. Model Acrophobe 101-X
 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.