Did anyone watch this episode? The klingons invading Cardassia because of their stated reason was not why they invaded...they invaded because they wanted to go back to the old ways, and this gave them the excuse..The old klingon dude, when he got drunk, told Worf this. And later, while telling Sisko, worf agrees..
Going after supposed Changlings was just extra...bringing back Klingon pride was the main reason...Sisko was right for warning the cardassians...
Rob