I sympathize with this argument, but it has several problems: Rights and wrongs are inherently social constructs. The is no (currently) discovered moral potential in the laws of the universe, nor is there a well defined, clearly bounded, definition of life.

I would argue that relativism is in fact the fundamental construct, and that societies only arise in the unstable balances between extremes.

That's not to say that fundamental rights cannot be instrumental in strengthening society, but since they arise from within society, they will need to be updated as society inevitably changes in time.