Remember that quote I posted in the other thread?
"I swear by my life and my love of it that I will never live for the sake of another man, nor ask another man to live for mine."
That's the core of it. She just shied away from taking that to the logical conclusion.
That's the core of Objectivist ethics. Your life belongs to you.
What's the logical conclusion?
Your life belongs to you. Government, through taxation, places a claim on it. I think you can do the math from there.

Btw, have you read the sword of truth series by Terry Goodkind?