If the Japanese controlled South Pacific Islands were under the jurisdiction of the Imperial Japanese Army and their Kempeitai, I’d be inclined to agree if Earhart and Noonan had crashed on them.
Most of the crazies and the worst excesses tended to be in the Imperial Japanese Army as they were far more officers…especially at the mid-senior levels who were highly fanatical, extremely nationalistic/fascistic in political orientation, and willing to expand the war than their Naval counterparts.
While there were some crazies in the Navy, very few of them existed beyond the junior ranks…and vast majority of those were apprehended and either cashiered or executed for being involved for their involvement in a series of militaristic assassinations or involvement with Army factional infighting which culminated in the attempted February 26, 1936 coup by the Kodoha(Imperial Way) faction vs the Toseiha(Control Faction).
One of the reasons why General Hideki Tojo rose in influence in the Army was because he was part of the latter faction which felt the former faction was too radical and worked with like-minded colleagues to put down that coup and purge or demote into powerlessness officers in the former faction.
The Navy’s relative lack of fanaticism relative to their Army counterparts…including the relatively “moderate” Toseiha faction which won the factional infighting and gained a stranglehold on Imperial Japanese politics/governance was one key factor in why the Navy had relatively little political influence and many of its key admirals were regarded with some suspicion…along with the fact the very nature of their service allowed their Navy counterparts much more contact with foreign influences/cultures…especially the British which the IJN was directly modeled on and which received the benefit of much technical assistance/training until the early 1920’s.