- Observations:
1. The idea that justice is doing good to one's friends and harm to one's enemies is actually _in_ Plato (it's proposed in _Republic_ I 332d, and rejected by Socrates with downright sophistry). --- ETA: doing good to one's friends and harm to one's enemies is however revived as a desideratum for the guardians of the ideal city (_Republic_ II 375), and its psychological plausibility is held to be established by the fact (!) that pure-bred dogs are lovers of knowledge and wisdom (II 376). I am not, as they say, making this up.
2. The idea that justice is doing good to the good and bad to the wicked is also in Plato (_Republic_ I 334d -- 335b). This is not _quite_ the "eigenmoses" idea. It too is rejected because treating people badly makes them worse (I 335c), and because it's supposedly "it is certainly not the property of good to do harm, or treat people badly" (335d), which seems question-begging.
3. The problem of two internally-cooperating but mutually-hostile sub-populations seems insuperable for this approach.
4. I still very much like the idea of using self-consistent linear algebra to break out of vicious circles (cf. http://bactra.org/weblog/479.html).