Quote 4
"It just goes to show," Teddy said. "Love of science is universal across all cultures." (19.58)
Would we kill the mood by bumping "Give Peace a Chance" at maximum volume? Seriously though, Mark would never have made it home if it weren't for the bond between NASA and the CNSA—a bond created by a mutual love of science.
Quote 5
"Space travel is dangerous [...] They're sad that they lost a crewmate, but they'd be devastated if they found out they'd abandoned him alive." (6.110)
This is a tough call. Would knowing that they left their friend behind make the crew feel any better? Or would it only make them feel worse? There are no easy answers to these questions, but the truth has to come out eventually—that Band-Aid needs to be torn off.
Quote 6
"As soon as we come up with a plan for rescue, we can tell Hermes. There needs to be some hope, or there's no point in telling them." (8.85)
Super-friends to the rescue! See, NASA knows that the crew will jump at the possibility to aid in Mark's rescue—as we see later, they'll do it even without NASA's approval. Their friend is stuck on that lifeless rock, for Pete's sake, and they won't let anything stand in their way.