Fish climbing trees

Ultimately, at the end of the day, a decision had to be made and, for some reason, he was the one they were expecting to make it. Unfortunately for the opinions and feelings of many, Seth couldn't bring himself to simply abandon people just because they were considered 'useless' by others. 

Civilisation might have collapsed, but that didn't mean civility had to go with it. It was not good enough to just survive day to day, they had to instead strive to rebuild society. Not how it had been, but better.

These people might be called useless when it comes to fighting or handling corpses, but they had other uses that they simply hadn't had the opportunity to show yet. A civilisation based on nothing but warriors wouldn't last for very long.