question:  Why was Infield opposed to a world comprised completely of the Cured?
context: "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? 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." The gyro actually passed over a man's shoulder, through his legs, under his arms. "You know, Henry, not all of our Cures are so—so—not all are like that. 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? Infield stepped into the main stream of human traffic and tried to adjust to the second change in the air. 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. A clean-cut young man with mouse-colored hair was moving toward the stubble-chinned, heavy-shouldered man quivering in the center of a web of impervium cables stuck secure to the walls and windows of buildings facing the street, the sidewalk, a mailbox, the lamp post and Infield. The magnetic suction dart dropped away from Infield like a thing that had been alive and now was killed. Infield's pulse raced, trying to get ahead of his thoughts, and losing out. Infield shifted around, trying to see that side of his benefactor, but couldn't manage it in good grace. People take one look at your Cure and don't ask you to go walking in the rain. Infield supposed it was a Cure, although he had never issued one like it. The Cures were supposed to save lives, not endanger them.
output:  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.
options:  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.