I think there's a lot of propaganda out there to fool people into thinking that we are mostly out for ourselves and that empathy with others is too risky or even foolish so we should see relationships as mere power play but I'm sure they are much more than that.
Not even social groups by themselves are enough, communities need to actually be healthy and possess ethical standards which people need to follow and be judged by, otherwise people can even fall into all kinds of violence and have their minds broken by social pressure and the violent anarchy that can happen.
This takes a lot of effort, however, and people nowadays don't take nearly as seriously as they should...
there doesn't seem to be anything here