Originally posted by red g jacks
i don't understand this. how can it be necessary but not justified.
Because those words are not synonymous.
"Necessary" just means that on some level, it "had" to be done. So, you had to kill the man who had a knife to your daughter's throat or else your daughter would die. Or, depending on what you think of capital punishment, it might be necessary to put serial killers to death because they pose a certain threat to society.
"Justified" means that it was a morally good and righteous deed. "I'm a good person because I shot that man in the head".