That third option doesn't really exist. I know you're referring to the rotbrains, but also remember that the only person who says that's a valid choice is your character (read: a brand new Forsaken who woke up like 15 minutes before). Re the devs,
Forsaken who are third party are a rarity. If anything, I think it's more likely that they just managed to escape or run and join a protective faction than that leaving the Forsaken is a valid choice.if the risen corpse has not been destroyed, they are given the same ultimatum that other Forsaken are offered: join the Dark Lady or return to the grave.
And I very much disagree with your assessment of the death choice.. Just because you've died once doesn't mean you're suddenly okay with dying. People who have drowned or been in a car crash or suffered some other traumatic near death event typically become more afraid of that event happening, not fine with it.