The problem is that most proponents of Social Darwinism are unlikely to engage in any discussion such as this. The Ayn Randist libertarian types would decry the whole Voice of Humanity concept as an example of the "collectivism" that they despise. Having declined to participate, they would then ridicule any group message that claimed to represent humanity.
It thus seems to me that this group is almost certain to vote for a resounding affirmation of The Golden Rule, and "debating" this topic will surely be a matter of the choir preaching to itself.
I suggest we debate a more specific topic with no obvious answer, such as what can we do to actively counter the proponents of Social Darwinism?