Think about it. What would a depressed Klingon be like? Would it, could it, happen to them? Klingons are all about honor and glory and being a proud warrior, we've all seen it. Would it be considered dishonorable or weak for a Klingon to get depressed or sad?
Kurn was depressed after Worf went against Gorwon and they lost their land, titles and honour. He wanted honourable suicide and try get himself killed.
Well "emo" might be too strong a word, but when I saw the title of this thread my thoughts were along those lines. The first image that springs to mind is from that episode where the crew's fears are all being drawn out by some force and Worf hastily flees the bridge, recites some Klingon words in his quarters, then proceeds to nearly stab himself to death before Troi stops him just in the nick of time. He explains that he's ashamed of himself and feels he isn't a warrior anymore because he feels fear or something. It was somehow kind of touching and also hilarious at the same time. I can't remember the name of the episode of the top of my head, but I'm sure someone else can.
I would imagine in most cases that the depression would stem from being dishonored or weak, but that being depressed isn't necessarily a dishonor.
I think clearly they get depressed when they can't be "true" Klingons anymore. When they can't be effective warriors. Kor was depressed when he got to old. Worf was depressed when he was paralyzed. Kurn was depressed when he couldn't fight for the Empire any longer.
LOL. Well put. I love Klingons, but I was NOT a fan of Worf until the very last season and a half or so of DS9. Even then he could get on my nerves. Emo indeed.