Sorry, my post was too brief because I had to run off to class. I was simply curious as to where rights were assumed to come from; contrary to popular belief, I am not one to use "religious" as a derogatory term. It matters not to me whether someone believes that rights are an inherent part of human nature or a social construct; either way, the concept has been very useful to our culture. My curiosity was regarding the fervor with which they are sometimes defended here; I thought it odd that, on a skeptical site, they were beyond questioning.
I agree they are a social construct; that does not make them bad (was that what you read into my meaning? I am just wondering why you felt the need to explicitly group rights with other positive constructs; I think rights can stand up for themselves). If they were god-given instead of socially constructed, that would not make them either better or worse (it might make them less open to challenge, as I said above).
Your last sentence has me puzzled. Where do I suggest that a rational approach must be dishonest, amoral, and pro-slavery? (shouldn't that last be pro-property-rights?) I proposed long-term best interest of one's culture as a possible reason for laws; do those characteristics (dishonesty, etc.) seem like a long-term winner to you?