 Why was Infield opposed to a world comprised completely of the Cured?
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. 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. Men hide in the comforts of insanity, but when faced with death, they are often forced back to reality.
 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.