How exactly do the Klingons justify using cloaking ships, a strategy which necessarily involves sneaking up on an enemy and catching them unaware? Wouldn't sneak attacks conflict with their notion of honour?
Is it dishonorable for an Owl to strike down a mouse, snatching it before it has any chance to react? I would say no. You could see the tactics of a Klingon Bird of Prey in the same way.