True true, but that would take the firepower away from their main targets to a point, so torpedoes could also be used as a magnet for fire.
You either take the torpedo, or divert power in hopes of shooting it down.
If LF's focus on taking down the torpedoes, they'd be relegated to the support role, an awkward task but a worthwhile one. That is until they run out of CD's, then they'd have to try and harass bombers and VHF's and the like.
While I think LF's would be very suited to this role, would it be taken up?