Running away is retreating, how many battles/wars where won by the side which always retreated?
Have you ever heard of a Pyrrhic Victory?
Surviving = Winning.
Doomed suicidal assault = Losing.
Retreat is not a bad thing most of the time.
Sure if you're on home soil and you're the line between assholes and innocent civilians, retreat can seem bad, but even then, win the war not the battle.
I really don't think that Ransom tried running away because he still needed another 56 space Dolphins to make it all the whole way home.
Could the Dolphins have made it back to/found Earth, or got back to Earth in less than 40 years?