I swear, seems like you can't watch any show these days without someone taking a few lines from it and drawing some parallel to suit their particular social or political agenda... can't we just take the shows at face value? If I wanted to watch social and political commentary I'd turn on a news channel. Shows like this are meant for entertainment, the news is just depressing to watch.
To this particular scene, I really thought the facial expressions on both Kira and Damar's faces said so much more than just those lines. You can almost just see the wheels turning in Damar's head on that one. He's about to snap back with some scalding come back and then just suddenly realizes... yeah I killed Ziyal for the same reasons the Founder killed my wife and kids and realizes he wasn't much different than the enemy he was fighting.