[ Rokurou mentioned wanting to fight others and also being in jail, so Kaneki has a feeling he wasn't the type to just want to live a normal quiet life like a lot of ghouls - and kaneki - do.

Kaneki smiles just a little when Rokurou mentions a friend ]

... You could say that. [ he does have many ghoul friends, now ]

It's the same with ghouls. But they don't have a choice. [ they kill and eat humans. But they can only eat humans. That's all they can do.

Kaneki is the same, in the end.

There is another pause, longer than kaneki would want it to go on for, before he reaches for his eye patch and takes it off. He allows his eye to change into black and red, showing a clearly not-human eye.

he thinks it's fair that he tells Rokurou this, after all the man just told him about what he is as well ]

I was turned into one two months ago.