Why did the father add "It all depends" after he answered his so

Reading Comprehension
Read the quoted parts carefully and answer the questions in English. "Is dying hard, Daddy?" 
"No, I think it’s pretty easy, Nick. It all depends."
Why did the father add "It all depends" after he answered his son’s question?
【正确答案】：

WHEN THE FATHER SAYS THAT DYING IS PRETTY EASY, HE MIGHT BE THINKING ABOUT THE SELF-MURDERED HUSBAND. BUT WHEN HE REFLECTS ON THE WIFE’S MIRACLE SURVIVAL OF THE VIOLENT PAIN IN THE WHOLE PROCESS OF BIRTH, HE ADDS THE FINAL SENTENCE. DYING IS BOTH HARD AND EASY, IT ALL DEPENDS ON INDIVIDUALS. 

【题目解析】：当父亲说死亡很容易时，他想到的可能是那个自杀的丈夫。但是当他想到那个在分娩过程中经受了剧烈疼痛却又奇迹般幸存的妻子时，他又加上了最后一句话，死亡是很难的。死亡既艰难又容易，这都取决于个人的选择而已。