I’m not sure if perhaps you mean genre and not ethos.
If by ethos, you mean a set of guiding principles and ideals as a community, I think we’ve been doing okay.
There’s been some demoralization, but that happens. Speaking of which, a character several years into the apocalypse should ride the line between “is this real” or is this fake.
There are more mental diseases than schizophrenia and hoarding, and I think that the longer you go in the apocalypse, the more gradual the transition from the reality of the hoards of undead outside to a more fantasy world. Of course, in this game, there are no “good” hallucinations, or coping madnesses. Drugs in it have a nice short term win/long term burnout, but people in the real world are nuttier than you’d think. A lot of it is coping.
The player ought to get mental traits that make the spawning of these supernatural “Lovecraft” creatures more likely.
Make a hallu_version spawn nine times out of ten, but then the tenth one is real.
Also, monsters ought to get worse. Dermatiks into chestburster-like things, zombies having various degrees of decay and slowing down, radiation increasing.
As James Cameron wrote in the screenplay for Strange Days, “Things got bad. Then, they got worse.”.
Speaking of which, anyone ever see that movie? Great sci-fi reference to pull things from.