Why is Ralph seen as thoughtless in chapter one?

Ralph is seen as thoughtless in Chapter One because he is more focused on exploring the island and having fun rather than considering the seriousness of their situation or listening to Piggy's practical suggestions. He dismisses Piggy's advice to create a signal fire and instead sees the island as a place for adventure and leisure. This thoughtlessness highlights Ralph's initial immaturity and lack of understanding of the gravity of their predicament.