There is a difference between altruism and submitting to robbery.
In Atlas Shrugged, what is going on is robbery and enslavement operating under the mask of enforced "altruism". The main characters of Atlas Shrugged behave altruisticly to each other, loyally working and taking risks for each other. What they object to is the willfully-unproductive thinking that they have the right, by virtue of their existence, to DEMAND the fruits of the labor of the productive.
They do not. They act in their own interest. This self-interest implies loyalty and fidelity to ones friends and allies. But it is most certainly NOT altruism.
What they object to is the willfully-unproductive thinking that they have the right, by virtue of their existence, to DEMAND the fruits of the labor of the productive.
So... They reject the idea that "If someone takes your cloak, do not stop him from taking your tunic." So do I, and so does Ayn Rand. But since these are Jesus' words (Matt 5:40, Luke 6:29) Christians are expected to do just that.
QED.