Look at animal society for an idea of what "rights" are natural. Now, that does not mean that different sets of rules aren't more or less useful than others. But that doesn't make them any less arbitrary. You can pick parameters that optimize the lift of a wing, but that doesn't make those parameters "natural" or "god-given." Whatever "truth" exists in those parameters is defined entirely by the desired outcome.

"Right to life" and "right to property" are socially useful fictions, encoding rules that optimize in some way desired social outcomes. They are useful only to the extent that they further those outcomes. The metes and bounds of those rights are defined socially. We might argue, internally, that some configuration of those rights would lead to outcomes that we as a society think are desirable, or that some configuration is incompatible with other configurations, but whether they are morally "right" or "wrong" is a socially constructed fact.