He eventually stopped shooting bears himself, but continued to guide and probably became more successful guiding for still and film photography groups. Because he did stop hunting, many thought of him as a conservationist, which was an assumption made in error.
As for the bears, he had never thought much about wildlife conservation unless it affected him personality. During his years as a hunter, when he found areas where bears had been exterminated, he had been annoyed only because other hunters had gotten their first. He complained about poachers only when he thought he wasn't getting his fair share.Bear Man of Admiralty Island, by John R. Howe, is based on the letters written and interviews with Hasselborg's family and clients.
Wildlife wasn't sacred to him by any means; it was there to be used. As long as he had enough for his own use, he didn't much care about anyone else.