Jacob refused to be comforted

When Jacob was given his son’s coat of many colors dipped in blood he realized that Joseph must have been devoured by an evil beast. In Genesis 37:34-35 we read that he tore his clothes and mourned for his son. All his sons and all his daughters rose up to comfort him; but he refused to be comforted; and he said: “For I will go down into the grave unto my son mourning”. Thus his father wept for him. What I glean from this is that any parent who loses a child will forever mourn that child until the day that the parent joins the child in death. Then why is it that society wants us to quit mourning our children and to “move on” as if the catastrophe of losing our children is to diminish with time? 

https://www.amazon.com/Topics-Grief-woman-who-lost/dp/1480224898/ref=sr_1_1?ie=UTF8&qid=1460397653&sr=8-1&keywords=topics+in+grief