If necessity is insufficient justification, then the murder isn't necessary. You could choose to die (or watch others die) instead of doing the murder -- I would honour and respect that, as I honour and respect those many who were objectors in wars and many of whom did die for that.
The thing I will not accept is "necessary and not justified", it makes no more sense than "1=0". If it was not justified then it was not necessary, there is always a choice to avoid it.
Note that killing is not the same as murder. The latter is generally premeditated (thus giving a chance to think and to do it deliberately knowing (at least some of) the reasons why it is a bad thing), is usually against a person who is no direct threat, and is often done with greed or other gain in mind. Killing in self-defence, or in defence of others, may be considered necessary (or may be consequent to attempting to stop them but not intended), but by definition the person killed was guilty of initiating force and so take part of the blame for their own death.
no subject
The thing I will not accept is "necessary and not justified", it makes no more sense than "1=0". If it was not justified then it was not necessary, there is always a choice to avoid it.
Note that killing is not the same as murder. The latter is generally premeditated (thus giving a chance to think and to do it deliberately knowing (at least some of) the reasons why it is a bad thing), is usually against a person who is no direct threat, and is often done with greed or other gain in mind. Killing in self-defence, or in defence of others, may be considered necessary (or may be consequent to attempting to stop them but not intended), but by definition the person killed was guilty of initiating force and so take part of the blame for their own death.