The appeal to nature argument does very little for the right wing, as capitalism is the soul perpetrator of the demise in human nature.
The human nature argument should appeal more to the anarchist crowd.
There could definitely be a case made that human nature is inherently good or rather, within evolution, it should if left un touched, lead to a fulfilling life as everyone who does not adhere to their natural impulses refrain from reproduction.
There is also something sinister in pursuing an artificial life.
The case could also be made that these thoughts are simply our instincts fighting back against its own irrelevance in the modern world.
But then again, the case could be made that instincts are the backbone of our concept of morality rather than formed purely by environmental factors.
What I'm trying to say, is that we are (through capitalism) currently in the process of changing all of humans very rapidly and that an artificially created life is although good, ultimately something we should avoid simply because life itself, compels us.
Now you can go ahead and call me the exception but I don't think you are gonna.
If what humans today find ultimately in-human and downright malevolent, should we, knowing that our children's children might never adopt this notion and happily pursue such ideas, should we even allow them?