The boys were in some kind of military school before they landed on the island so they were being taught about respect and discipline. When they grew up some of them were probably going to join the military some some of them would have being killers if they would never have landed on the island. I think that Jack would have probably killed some one even if they hadn't landed on the island just because of his attitude that he wants to be in control of everything and wants to have fun and not do the important things. Some of them though would never become killers because they are too scared or obey the rules too much.
I think that being thrown into the rule of hunters might have contributed to them becoming killers because they spend their days killing animals and connecting with their wild side. They also didn't like each other like Jack and Piggy or Jack and Ralph so eventually after all the time they had to spend together somebody would end up dieing. Even after the boys are rescued though they will need some therapy or something because they went through a traumatizing experience they killed their own friends and peers. They spent way too much time killing things and even Jack isn't called Jack any more they call him Chief. They have refused to act civilized so entering them into a society that has laws will be hard. If they get rescued they will have to get accustomed to how things work in the real world where they can't run around naked with spears and face paint.
In the future I think that they will all end up going crazy and completely insane they will end up killing each other and never get rescued. Ralph will go insane and try to kill Jack to try to reestablish dominance and become Chief again so that they can start the fire and get rescued. Jack will also try to kill Ralph and get ride of him forever