Some of them find their own target. We've had acoustic torpedoes that find their own target since WW2. Just hope that only enemies are in area where you use them.
Again, no. The torpedo is fired at a specific target and the acoustic homing is used for terminal guidance. You know where the torpedo is going and you have a fair degree of confidence in what exact target it's going to hit. YOU chose the target, the homing is just to make sure it hits it.
If you had a theoretical torpedo with a 500nm cruise range, you don't just turn it loose in the middle of the ocean and see what it finds.
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