No mercy
To begin with, talking about justice was difficult even in the past. The meaning of the word justice could vary from person to person, depending on their lifestyle, their childhood upbringing, as well as their own experiences over the years. Therefore, to say exactly what was justice would be too difficult.
However, there was a general rough idea of what justice was, and even if there were certain differences, the core was not very different.
Kang Rong was clearly not being fair as he not only broke his part of the deal he had with the other members of the base government, but also stood idly by even though many innocent people were starving to death.