I normally only sink boats like that if I think they've seen me. If I can dive in time and am reasonably certain I haven't been spotted I usually leave them alone.
One of the things I've discovered in my World War 1 research is the number of u-boat commanders who attacked and sank whole British fishing fleets. On the other hand they pretty much universally put the crews in lifeboats and scuttle the trawlers with dynamight charges or shells after they were abandoned.
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“Never do anything you can't take back.”
—Rocky Russo
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