Captain James Cook’s voyages in the South Pacific in the late 1700s exemplify the law of unintended consequences. He set out to find a westward ocean passage from Europe to Asia but instead, with the maps he created and his reports, Cook revealed the Pacific islands and their people to the world.

In recent decades, Cook has been vilified by some scholars and cultural revisionists for bringing European diseases, guns and colonization. But Hampton Sides’ new book, “The Wide Wide Sea: Imperial Ambition, First Contact and the Fateful Final Voyage of Captain James Cook,” details that Polynesian island life and cultures were not always idyllic.

Priests sometimes made human sacrifices. Warriors mutilated enemy corpses. People defeated in battle sometimes were enslaved. King Kamehameha, a revered figure in Hawaii, unified the Hawaiian Islands in 1810 at a cost of thousands of warriors’ lives.