Social Mores/Popular Culture all exist to bind oneself to a "Group Identity". The problem with today's hyper-connected society is that it has become so pervasive that it is impossible to escape it completely. You have to learn to live both within and apart from it.
You grouped all social mores into a single reason and provided a criticism at the same time. That suggests you have entirely failed to consider them deeply; we did not gain our social mores in one fell swoop.
I don't think even the social mores of breaking bread or offering your guests food and water came from the same place.
