^Yes, the episodes end with the crew joking, but they're not joking about the redshirt deaths ... the producers didn't want the viewers to go away depressed, so the conceit of a "happy ending" was used.
No, they're not, and like I said, it seems
almost as bad — but there are worse things.
(Actually I thought I picked up that point from you. Have you posted in the past about the incongruity of humorous endings?)
Anyway, we still have, "Let's get the hell out of here." They could be serious when needed.