A true Klingon rejoices at the death of his enemies, old, young, armed, unarmed. All that matter is the victory.
-Ch'Pok (While framing Worf)
I do believe Klingons take the idea of honor sincerely, but they define it radically different than humans do. Winning, by whatever means, is honorable. Losing is not. You can't really compare Klingon honor to human ethics.