Weird news - Father throws his son out of the window, son dies

Fathers are typically the ones who are expected to ensure that their children are safe. In history, there are literally countless cases where parents have given up their lives to save their children, or dedicated their lives to ensure that their children have a better life. So, it seems very strange to come across cases where you find parents ill-treating their children, or in this specific case, actually causing the death of the defenseless child, one who cannot protect himself and for whom everybody expects that their parents will be the one who take care of them.
In this case, the parents had 4 children, 3 daughters and 1 son (and in these areas, having 1 son and 3 daughters would mean that the son would be very well thought over and loved by his parents), and yet the son was thrown out of a window during an argument and died (link to article):

Police added the couple was married for 11 years and the boy, Hanif, was their fourth child. They had three daughters as well. "The couple was fighting on Thursday and Hafiz, in a fight of rage, picked up the boy and threw him from the balcony of their house situated in Jodhpur's Nai Sadak area," said the officer. Neighbours informed the police and rushed the injured boy to the hospital. "The boy had sustained injuries on his head and other body parts. He was admitted in the Intensive Care Unit," said the officer, adding that Hafiz was arrested on charges of attempt to murder.