What harsh lessons about survival and morality do the refugees of The 100 learn during their time on Earth? For two seasons, the group sent from the Ark has been at war. First they fought among themselves, then against the Grounders, and finally against the people of Mount Weather. Many lost their lives along the way, and all lost their innocence. They learned the hard truth that in the fight for survival there are no clear heroes or villains only the living and the dead.