@Leonidas: Why would you want to get your dorf out of the library?
Here's my reasoning: Start with this explanation of the new emotion system.
The problem is that seeing people killed or seeing bodies generates the most powerful negative thoughts in the game. With the new memory system there are sixteen (8 short term/seasonal, 8 long term/annual) slots for memories. The stronger a good or bad thought, the more likely it is to take up a short term slot, and the more likely it is to eventually take a long term slot.
The negative thoughts from death and corpses are the strongest in the game so they are basically guaranteed to take a slot each. According to the emotions page on the wiki it takes communing with a god, playing with a child, or something equally positive to generate an equally powerful good thought.
On the emotion chart we want the -1 entries, since those should be most likely to counteract the horror: Adoration, Bliss, Delight, Joy, Jubilation, Love, Lust, and Rapture.
Looking through my dwarves, I'm seeing Bliss from dining and sleeping, Delight from meals and performances, and Rapture from prayer and owning fine items.
When I look at my scholars, their stress reduction from reading is Interest and Content, which are the weakest possible stress reduction.
My conclusion: To de-stress dwarves, you want them in the temple or the tavern. Every day that they're reading in the library is a day that they aren't praying or listening to poetry. So the library is closed until 44.11. And I'm considering a civilian alert burrow on the tavern, to force-feed them entertainment until they cheer up.
Edit: I should note that this is all anticipatory. My dwarves aren't stressed yet. Only five of them have positive stress. But this emotion system seems to move slowly with strong momentum, so I want to get out in front of it before it runs me over.