You probably noticed, as did others, that I did suggest there was a choice of only two positions, one side or the other. And that makes answering difficult.
(An aside, when you mention which was first, the chicken or the hen -- I think you meant chicken or egg -- there is in fact a good answer to that one: the egg came first, being laid by something "almost-but-not-quite-chicken" but containing an embryo genetically slightly different than its parent that is, in fact, chicken.)
In this case, my own view is that there really isn't a good choice on one side of the question or other: both are equally important, and you can see this watching people facing a crisis. All of a sudden, and only while the crisis is ongoing, people will most often put aside their animosities and work together, for the benefit of all, because there are times when this is simply necessary.
As a Humanist, I agree with
@9-10ths_Penguin and
@It Aint Necessarily So in this thread, who don't see our differences and our individuality as necessarily antithetical to social cohesion. For the Humanist, the way around this is to accept others who are unique and/or different, so long as they are doing no harm. In this way, in fact, we believe we end up with much richer communities -- communities that, when they do come together at need, have access to many more skills and ideas than smaller, much more homogenous ones. We view that as a strength.
Humanists, like most other people, value both our belonging in our various communities, and our individuality and desire to pursue our own ends in our own ways -- and we value these equally. This allows us, or so we hope and strive, to value the individuality and self-pursuits of others, and at the same time accept them gladly in our communities.
In the end, I think this is the only way forward for humanity. Carl Sagan thought so, too, as have many other philosophers. As we get more powerful, and invent better and better means of destroying each other and our very planet, if we retain our ancestral fear of "outsiders," we will destroy both them and ourselves.