How is piggy useless in the Lord of the Flies?

Piggy is not useless, Piggy is a needed character to contribute to the story, if it was not for Piggy there would be no fire, they probably would not of built a shelter so early, more people would die from accidents such as in the beginning of the story. In addition, Piggy is also Ralphs right hand man that kept Ralph in check and stopped Ralph from getting killed multiple times.