Some common reasons include: 1  a serious accident â such as a road accident, a severe head injury, a serious fall or severe burns. 2  a serious short-term condition â such as a heart attack or a stroke. 3  a serious infection â such as sepsis (blood poisoning) or severe pneumonia.
The definition of unnecessary is not needed. An example of something unnecessary is a bowl of sugar for cooking meatballs.
That is not to say violence is always unnecessary â as I feel people are perfectly entitled to defend themselves against the initiation of violence (to include violence initiated by the State). However, war as defined by two State powers fighting each other is always unnecessary.