My fortress is now in chaos. Nobody has had a meal or drink since Insurrection Day, nobody has been able to rest, several dwarves are dead, and as a result many more are miserable. The job cancellation spam is horrendous, the militia commander is tantruming through the dining hall, various members of the coup are passed out around the fortress either from exhaustion, wounds, or both, and nobody can get anywhere. Clouds of miasma obscure everything, and contribute to the foul moods. Although there are only 12 reported dead, the entire fortress has ground to a halt. Since the only pick is now lodged in my expedition leader, nobody has been able to dig away from the madness. Attempts to divide the fortress using burrows have failed. The lever that should be releasing the emergency floodgates to drown the fortress was destroyed by a tantruming dwarf, and so the Final Solution has failed. FPS has failed. Hope has failed. All has failed.
Some of the conspirators are finally dying where they lay as I type this, but the tantrum spiral is worsening. The militia commander just went insane (but not berserk), and the Metalsmith apparently killed her husband along with her child, and is now on the verge of tantrum. In fact, a cursory glance of the fortress reveals that all my dwarves are miserable with the exception of 6 dwarves who managed to haul themselves to the hospital. Those 6 are starving and dying of thirst, as nobody can bring them food past the Bone Carver, who in turn has lost the ability to stand and move from his position inside the hospital.
In lieu of watching the grisly, but predictable end, I shall elect to abandon now and go to sleep.
As far as loyalty goes, I have observed confusing and contradictory loyalty shifts that ripple beyond the initial culprits. I think the civilians may be becoming enemies of the parent civ or fortress gov after killing rebellious dwarves, causing a chain reaction. Further research is needed, and I plan to establish a small controlled fortress to note and log loyalty shifts in detail, instead of a random mass of flailing axes, hammers, and swords.
Long story short, killing your liason is FUN.