Why does anger grows from grief?

The inability to explain the reason for anger sprouting from grief has been expressed in the poem. It seems that the knowledge of great distance between the father and the son, and the differences between them create such a sad and troubled situation that it gives way to anger. Thus, anger can be seen as sprouting from the frustration regarding the troubled relationship. Both of them want to reconcile yet find it difficult to do so because of the lack of understanding which is very unsettling.