This is the way it was in the early war, as time progresses the Japs formed more convoys with escorts. Don't forget that in the Atlantic they were fighting U-Boats for years and learned how to protect their ships.
I assume that early in the war the Japs assumed their freighters were safe near home waters, this definitely was not the case in the long Atlantic voyage of Allied convoys.
Also the Allied detection equipment was much more advanced than the Japs, especially early on.
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