Objectivism (Rand's philosophy) didn't defend a society comprised of people with no obligations toward each other. Like most libertarians/classical liberal philosophies, it supports the NAP[1], as well as defending the necessity of an impartial law system.
It just defends negative rights, instead of positives ones, not a lack of rights and obligations. See Isaiah Berlin's Two Concepts of Liberty[2].
EDIT to your EDIT: in Hobbes' state of nature, everyone has the right do to whatever one thinks is necessary for one's own preservation (including, say, killing others). For Rand, one has the right to not be attacked by others, even if that goes reduces the others' chances of self-preservation. The two are very different, and the latter does impose (negative) obligations on individuals towards others.
Ah, those links refreshed my memory- I was incorrect in my edit- that approach more closely resembles Locke's state of nature. But thank you for showing me that Rand gets there from another angle.
It just defends negative rights, instead of positives ones, not a lack of rights and obligations. See Isaiah Berlin's Two Concepts of Liberty[2].
EDIT to your EDIT: in Hobbes' state of nature, everyone has the right do to whatever one thinks is necessary for one's own preservation (including, say, killing others). For Rand, one has the right to not be attacked by others, even if that goes reduces the others' chances of self-preservation. The two are very different, and the latter does impose (negative) obligations on individuals towards others.
[1] http://en.wikipedia.org/wiki/Non-aggression_principle
[2] http://en.wikipedia.org/wiki/Two_Concepts_of_Liberty