Good morning - Plato argued that all people are born with certain innate ideas, one of which is Justice, which (in his opinion) is evidence that we existed in the world of Ideas (Forms) prior to birth. I think you're both right that we all have a sense or intuition that things could (or should) be more fair or equal, but I would still say we have so many ideas about what it means to be fair, our diverse ideas of justice are actually hindrances to progress. 
In the case of Colombia, I think Santos did what was possible to end the violence, although it may have fallen well short of what we understand as justice. If the years of shooting wars have really come to an end, justice may have to wait. The last time I was in Bogota, I stayed at the Tequendama Hotel. When I left the following morning to walk over to the Javeriana University, I was immediately escorted back to the hotel by armed guards. After so many years of violence and paralysis, this may be all that can be done. - Monica.