Conflict between the rational and the irrational in the Lord of the Flies?

I think we can better phrase this as the conflict between good and evil. This dichotomy can better be put into the context of your question. The need for organisation and support is integral to a working society. Golding, however, points out human nature’s need for chaos and personal gratification. A signal fire, shelters and a semblance of a constructive society are what Ralph, Simon and Piggy tried to attain. The others seemed to agree, for a time, but lust for primal pleasures (killing, screaming, playing.........) prevented rational thought. In the end rational and irrational become good and evil. Unspeakable things are done on this island including the killing of Simon, Golding's Christ figure.