Is it possible for them to identify with the fear, the hopelessness, the frustration, the anger, the loneliness and the agonizing pain? Have they ever felt a deep hunger and a desire to be whole again? Have they ever reminisced about the past and wondered what might have been, if only, and simply wished? Did they ever have their heart's desire walk away and never look back? Have they been left in the dark, dismal, frigid abyss never hearing the words, "I love you?"
No. They could not possibly comprehend.
For those who have felt it know how unbearable it can be, and they know you cannot just go out in this world wearing "the shield" for fear of leaving yourself open and naked.
Those persons can discern that it would be impossible to take that chance in life to love again.