I was just thinking about how the losties got on the flight. It seems that for a lot of them, they got on flight 815 due to making moral choices.

Claire decided to listen to the beggings of the psychic and give up her child to a couple in Los Angelas.
Sayid delayed his flight one day in order to give his friend a proper Muslim burial.
Kate could have left the farmer that she befriended in the burning car, but chose to move him away from harm instead of running from the marshal.
Ana Lucia decided to leave Christian and his immoral meanderings early in order to go back to her mother and confess what she did.
Hurley, despite nearly missing the plane, was determined to make the flight in order to not miss his mother's birthday (despite not being on the best terms with her at the moment).
Sun was about to leave her husband but decided at the last second to stay with him and honor their marriage.