Why does Ralph repeat there isn't beastie 5 times?

Ralph repeats "there isn't a beastie" five times to emphasize his belief in the absence of a real threat and to reassure the other boys. His insistence reflects his desire to maintain order and rationality amidst rising fears and chaos. By repeating this phrase, Ralph aims to quell the growing panic and reinforce the idea that their fears are unfounded, highlighting the struggle between civilization and savagery.