It's in the nature of Christians to care.
My ethical views are largely in agreement with Rand's, but not totally, and are based on the same kind of reasoning. I think John Piper did an excellent job describing that ethics and reasoning, but I obviously do not agree with some of his criticism. Here is my article about his article:
These two articles should give you a decent view of how my ethical principles are derived, and what they are. I do not expect you to agree with them, it is just for your information.
Hank