My theory is that erosion of community leads to people increasingly not caring about how they are perceived by others. Previously, social pressure made people f

My theory is that erosion of community leads to people increasingly not caring about how they are perceived by others. Previously, social pressure made people feel ashamed of their bad behavior. Now, there are no consequences for bad behavior, and it takes some modicum of effort to be nice to people you don't care about, and so the bad behavior continues.