Alas Babylon is very optimistic. It actually predicts both survivors andwhich seem somewhat far-fetched, IMO.a winner to the war
Just finished the book last night. I agree that it was optimistic, perhaps naively so. I kept comparing it in my mind with One Second After, which was pretty terrifying, and not very optimistic at all.
Lucifer's Hammer was just dark, IMO.
Footfall was more optimistic.
Enjoyed them both. It has been a while since I read Lucifer's Hammer. I agree there were very dark parts, but I still thought it left the survivors in a fairly optimistic place, with
elctricity generated by a nuclear plant and military jets flying overhead.
The Postman certainly qualifies.
Loved the book. The movie, not so much.