A Clockwork Orange Dr. Brodsky and Dr. Branom Quotes

Dr. Brodsky said to the audience: "Our subject is, you see, impelled towards the good by, paradoxically, being impelled towards evil. The intention to act violently is accompanied by strong feelings of physical distress. To counter these the subject has to switch to a diametrically opposed attitude. Any questions?" (2.7.12)

Here, Dr. Brodsky is explaining the mechanism for behavior modification/manipulation. But how in the world does Dr. Brodsky convince himself that it is natural for humans to choose to be nonviolent in order to avoid getting sick by thinking violent thoughts? How is that human? How can it be natural if your acts are dictated by fear or avoidance behavior?

"You felt ill this afternoon," he said, "because you're getting better. When we're healthy we respond to the presence of the hateful with fear and nausea. You're becoming healthy, that's all. You'll be healthier still this time tomorrow." (2.5.13)

It is noteworthy here that Dr. Brodsky treats Alex as a sick being, needing to be transformed so that he might act normally or "humanly" towards violence and crime.

"He will be your true Christian," Dr. Brodsky was creeching out, "ready to turn the other cheek, ready to be crucified rather than crucify, sick to the very heart at the thought even of killing a fly." And that was right, brothers, because when he said that I thought of killing a fly and felt just that tiny bit sick, but I pushed the sickness and pain back by thinking of the fly being fed with bits of sugar and looked after like a bleeding pet and all that cal. "Reclamation," he creeched. "Joy before the Angels of God."
"The point is," this Minister of the Inferior was saying real gromky, "that it works." (2.7.24-25)

Alex has been transformed into a Christian, or at least a person who ostensibly performs Christian-like deeds. What is the difference?