You can't be an asshole if you're going through some shit? Kevin died and came back to life, that's maybe the most alienating thing possible, but he's not being an asshole.And I think you're wrong..
Nora lost her children and while sad, many people did that day. She's a total douchebag but that's why she's such a good character.
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How many people there can say their daughter faked her death, almost destroyed the town, got killed by a drone and now everyone pretends like it was an accident.
Everyone in this show is going through some pretty alienating trauma but they're not assholes. Nora doesn't know how to deal with hers and judging from that scene from the future, chances are she never learned how to.