We can be as vulnerable and open and honest with others as is humanly possible. We can get 100% of the people in the world to try as hard as they can to love others, and there will never be a return to a world without war and hate and bigotry.
There is no going back to the way things were before the fall - not without the intervention of Jesus and our willing acceptance of His solution - dying to self and allowing Him to be Lord of our lives.
We are broken.
We cannot fix ourselves
God can and will fix us if we let Him.