If you haven't done it yet, you've thought about doing it: making all NPCs killable in Skyrim, as was possible in Morrowind ("A thread of the prophecy, blah blah blah"), is now easily done through the installation of this simple mod.
Time to return the favor, bitches.
The "No Essential NPCs" mod by Trira removes the 'essential' characteristic of all (or nearly-all) NPCs in Skyrim, making them killable - including that Brynjolf jerk in Riften and the Imperial generals.
The "No Essential NPCs" mod is the latest edition in our coverage of excellent Skyrim mods, coming after our best Skyrim graphics mods and a silly-but-fun "Skyrim Retro Graphics" mod.
No Essential NPCs is available now on Skyrim Nexus, visit the mod's official page to download and install. As always, if you encounter difficulties when installing or have questions, feel free to post for our support in the comments below.
-Steve "Lelldorianx" Burke