What does Piggy fear most? Is his fear more valid (legit) than the fears of the others? Why or why not?

Piggy fears being killed on the island. He well knows that in a Darwinian society like this, he is the least fit and considered the most expendable. When Piggy sees the chaos of the fire the boys unleash at the top of the mountain, Golding writes, "Piggy stared  into Hell." Indeed, this island is Hell for a boy like Piggy.