As far as I know, there are some border regions, were the empires struggle to gain control and territorial sovereignity changes quiet often. Top level 'international law' would be very useful to further reconciliation and transitional justice in newly (re)occupied territory. Given the extend of territorial wars and claims in New Eden, some kind of jurisdiction for captured enemy leaders, members of major pirate factions, and even large scale 'criminal' corporations would be highly desirable in deed. Somehow the empires must condemn massive violence against whole people, ethnic groups etc. Otherwise whole systems and planets would propably defect and start uprisings. The fighting empires would loose important public support.
Therefore, I imagine that the idea of human rights/crimes against humanity go quiet well with the Caldari and Gallente. That's my feeling from the lore so far. Both may refer to abstract higher values (with grave differences regarding the role of the state system of course). I don't know much about Amarr and Minmatar, though. Maybe the religious and tribal thing suggests a completely different approach to the problem.