and speaking of being friendly...
Psychomamma posted recently about rage all around us.
Some posited that it has to do with excess privilege, which may indeed be a factor. But I also suspect that people have been ever thus (angry). It makes me think that maybe a loosening (or perhaps simply lack of consensus on) moral standards is in operation here. Moral relativism and all that. I think many of us are simply unable to “be good” (ie, exercise self-discipline, operate cooperatively/altruistically, etc) without the strong, simple, and consistent moral framework offered by religion or well-entrenched social custom.
As clichéd as it sounds, I also think violence glorified in popular culture (TV/movies, songs, video games) has an influence. To those (stupid) people who like to think that continual exposure to a particular behavior or message doesn’t have a significant effect, I point you to Calvin & Hobbes, where Hobbes responds to a similar contention with “That sound you hear is advertisers laughing.”
I also wonder if isolation plays a role. We're social animals, but now that we live together in such huge groups (ie, cities), it's not practical/possible to interact with everyone in a way that would promote empathy and cooperation -- it would take all day. So we develop the technique of ignoring each other except when necessary (ie, most of the ppl we see we treat as scenery). IOW, we necessarily develop the habit of de-humanizing most of the people we see every day.
In addition, we now have the ability to live in a way that insulates us from our dependence on others; because of electronics, mega-farms, smoothly-functioning transport infrastructure, etc, etc, we now have formalized, reliable methods of getting what we need (food, shelter, clothing, entertainment, etc) without interacting with other people in any meaningful way. So we don’t.