Malik
Superstar
It was damn near outright replied that Amelia volunteered for the mission in order to see her boyfriend. Also, you overlooked the part that they had test tube fertilized eggs on their ship. Plan B was to create test tube babies and repopulate the Earth that way. Lastly, being that Dr. Brand knew humanity's is lost, you may think as a father he wants his own daughter to continue living beyond that.
Oh..aight. Thanks for breaking that down.
I was wondering how that was all supposed to work out