One can compare to the Good Friday Accord in Northern Ireland. These peace deals by their nature legitimize those who were once call "murderers", "terrorists", etc. It's too much for some people to stomach. But, none of us can tell Columbia what their price for peace should be.
The reason for peace deals usually is simple: No side can win without loosing a lot. So, you accept some compromises. Yes, you talk with the enemy. Yes, you need to pay respect. Yes, people might stab you in the back for talking with the enemy and respecting him. But if you keep on fighting, you will exhaust your resources and even if you win, you will have less than you started your fight with.
Also, the people who stabbed into the back by the slim referendum rejecting the peace treaty, had been mostly urban residents and former government members, who a) had been far away from the dangers of the conflict and b) profited for a long time to have others fight it.
Those people exist.
I think it is a worthy receiver of that prize. Ending a war is the biggest of all fights.
