Legally? No. They were not negligent. The Atlantis rescue mission would have been a heroic measure that could have easily killed yet more astronauts.
Morally? It depends on all this background evidence that we ourselves don't know and Greg merely speculated toward.
Morally? It depends on all this background evidence that we ourselves don't know and Greg merely speculated toward.
Greg's core point, which you agreed was true, seems sufficient to morally dam them.
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