I've not read through much of the thread yet, but i'll back read it.
I'm a very un-competitive person and personally feel that people should not be "anti" one another for reasons to oppose against others. Most humans do rely on gang mentality, people will follow a crowd and act in (what they consider) an "appropriate" way against a slightly different crowd. The crowd may be a religious group, a sports team, a race or even just living on a different street to another person etc. These crowds aren't your own, you did not think up what the crowd stands for, it's simply human nature want to join a group and want that group to suceed. Just like the ape descendants in which we evolve from, (i'm a believer of most of the evolution theory, not many aspects of religion) we simply require a social support and allied network. Starting to loose what i'm talking about now.
The point is, I don't agree that people should group because, throughout all known history, it is almost always a group/crowd of people who will cause a clash with another crowd, because the group will simply think of themselves as either better than the other, or just think they're right and all others aren't. Each group wishes to "win", so will confront others, it's survival of the fittest, it's the way constantly evolving mind works within all living creatures on Earth. I truly hate the idea of the human genetics that have been lost in our history, due to battling early humans.
When i've read the whole thing, i'll try and post something that actually follows the lines of the thread haha. I also hope that doesn't offend anybody.