Thanks for at least replying to me (these W8 forums seem dead). The Rattkin Razuka faction is by far the scummiest (only 3 members, Rattus Rattus, Milano Calzone, and Don Barlone). Taking these 3 out does a few things:
1. The mystery of what happened to Rattus Rattus is eliminated (He didn't disappear, *I* made him disappear.)
2. By taking out Rattus Rattus, you can now easily take out Milano Calzone, and Don Barlone, one at a time (they are now Hostile to the party).
3. This completely clears out the Sixth Bough for the Trynnie (along with the Rattkin Breeders, and the other filthy rats hanging around).
4. Having completely cleared out the 6th Bough of Rattkin (and other enemies), you can now wipe out all Rattkin harassment squads, without any need to go back to the 6th Bough. Also, getting items for your troubles (Jazeraint Tunic, Astral Dominae, 80% chance at the Cane of Corpus, which you can sell, if having no Fairie Ninja in your party.
As for Crock, nobody cares if you whack him, you prevent a kidnapping, and get access to his chest (the only character blocking access to a chest). Also, it's almost self-defense, as you prevent a kidnapping.
The Rapax King should go without saying, as he is a genocidal maniac, and whacking him and his army will save The Rapax Queen, Rodan, and Drazic.