Video from post number 5 (not going to attempt the poster's username since he apparently sat on the keyboard to spell it
) was an actual battle where a crewman on USS SILVERSIDES was killed, makes my point - trading the life of a qualified submariner for a fishing boat is a bad trade. In game is different, shooting up lifeboats and rafts doesn't change the score one way or another, and they never shoot back.
Real life is a another story, sinking that fishing boat cost more than it was worth.