At what point would a war undertaken for a just cause become an injustice?

0) Never, by definition, the means always justify the ends for a just cause

1) When the war is not engaged in for defensive measures

2) When it's clear that the war, despite the cause, is being waged primarily for a political purpose

3) When nuclear chemical biological weapons are considered

4) When a draft is instituted

5) When emergency power directives are granted/passed, or civil rights otherwise circumvented

6) When my side begins losing

7) For a reason not specified above

8) Wars are never justified