If I were Kaneki, I would at least do something like Zero (code geass) where Kaneki should broadcast his past, in how he was a human that later came to understand ghouls, and how he wishes to create a world where humans and ghouls understand each other. It may not do anything but it will surely make ghoul sympathizers support him.
Not to mention having Kurona Yasuhisa's past, being known to the world, would REALLY put the CCG on fire.