Capital punishment is right when authorized by the government with proper jurisdiction, such as in the crucifiction of Christ.
War is forever right if authorized by any nation's government.
Commiting suicide is right if authorized by the person murdering himself. Bringing down an airline, thereby murdering everyone on board, is right if authorized by a quick prayer to God. See that's the trick. Make sure all your murdering is authorized. War is forever right if authorized by any nation's government.