I don't think AI fires passive torps, but humans sure do! If you're playing with LW/Ami though, passive torps have a very hard time acquiring subs are are practically useless against them.
On the other hand, once Amizaur's torp control mod is finished, passive decoys may become a lot more important, since the player will be able to switch the torp from active to passive homing at will!
Edit: Here's a tip. Mark the incoming in BB and check the speed in DEMON. If it's 50-55 knots, it's active. If it's turned down to 45 or lower, it's probably passive, so get the right decoy ready! (TEST-71 exempted)
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