Brain gained, paradise lost?

Our brain, which creates our particular intelligence, consciousness, language and theory of mind; we think all this is advancement, progress toward a supreme being. But could these features simply be a specialisation? A specialisation necessary to protect us from what has become our greatest threat: our own race, our own complex society. Could it be a specialisation necessary to understand ourselves, to thrive or survive in our society. To escape and to dominate our own species. And if so, what have we lost in exchange for this specialisation that focusses so much energy on ourselves? Maybe a connection to all other live? Or maybe the understanding that all live on earth is one? Is that the paradise we've lost?