When you wrote "deep down we are all connected" it seemed clear to me why some people might fail to see that. In order to see the "deep down" of ourselves, one needs to care for his/her own thoughts and needs. So one can get stuck there, maybe indefinitely. It is also so much easier to divide something rather than to connect. If we do not spend time with ourselves in our own mind, we will fail to see the connection anyway and find the easiest, least resistance way.