For a species born in a time when resources were limited and dangers were great, our natural tendency to share and cooperate is complicated when resources are plenty and outside dangers are few. When we have less, we tend to be more open to sharing what we have. Certain nomadic tribes don't have much, yet they are happy to share because it is in their interest to do so. If you happen upon them in your travels, they will open up their homes and give you their food and hospitality. It's not just because they are nice people; it's because their survival depends on sharing, for they know that they may be the travelers in need of food and shelter another day. Ironically, the more we have, the bigger our fences, the more sophisticated our security to keep people away and the less we want to share. Our desire for more, combined with our decreased physical interaction with the "common folk," starts to create a disconnection or blindness to reality.