This guy is an intellectual amoeba, floating in space, eating, defficating.
The acknowledgement of certain rights is what separates us from the animals; the whole concept of "do unto others..." and the ability to enforce/reinforce those rights. Generally, humans know that it is wrong to kill another human, based on the concept of "rights" of another (unlike lesser animals). Self preservation is innate (God- given?) but codifying the techical details requires a concensus.
IOW life, liberty, and the pusuit of happiness are innate qualities (God-given?) and, therefore, we as a nation decided to form government/set of laws to protect these basic tenets
Yes, this is a unique "invented" human concept. So is time or mathmatics....sorta. You guys could argue forever that there is no such thing as mathmatics; that although 2 plus 2 equals 4 in any intellectual plain, it is human reasoning and acknowledgement of principals that "makes it so".
As with math, sometimes you have to start with a postulate, an unprovable but self-evident fact, to build on. Will he agree that self preservation is an inalienable right? If so, you can build a case for the 2nd. If not, you might as well part ways.
Do the Chinese have the same rights as us? They should, but in reality they don't. We originally formed a gov't to protect our rights...Yet there has been a gradual, increasing usurpation of these rights that we allowed to occur. As said earlier, the 2nd has two purposes; to allow for self protection and to allow for the continuance of the country. As we want it.