There is no way to prove this beyond the shadow of a doubt (or at least not any ethical way) but I believe that Aristotle was right when he said that people are political animals. I think that we are pretty much made to live with other people and not alone.
Philosophically, this makes sense. We people tend to spend a lot of our time interacting with others. We talk about how we have a need to be around other people and how we draw comfort from the presence of others.
There may be other sorts of evidence for this. We know, for example, that babies are pretty much hardwired to pay attention to faces from the time that they are very little. This seems to me to indicate that people are meant (before they are even impacted by culture) to interact with one another in social ways.