Back every generation people had to spend more time working to survive, there was less time to think about yourself. Not to say greed and selfishness didn't exist, but according to what is interpreted by history, there was more respect and honor for others. As humans got more technologically advanced, humans became more self-absorbed and disconnected.

Now that people don't work to survive, we have more time to entertain ourselves. Most of us don't have to work in a field to produce food, or kill animals for survival. Thanks to technology, we can mass produce and get food from the store.

However, to say that no one cared about themselves in the good olden days is bullshit. Just the general population didn't reflect it. Hell I bet there're people who bitched about the same thing.

However my point is to say as long as technology keeps advancing, the world will grow more disconnected and self-absorbed. It's evitable.