Just another plot by the Woman to have the Man bring us down?
I agree protection orders are used outside their intent (and if you believe the stats DeBecker talks about, they are also ineffective in the very circumstances most people think they are necessary). But let's pause to note that all the talk asking how anyone knew which guns he had has a rather dull, likely explanation - his spouse may have told the judge.
In fact, DeBecker asserts the Restraining Order is often the trigger for violence.
You raise a valid point about the spouse telling the judge about the guns, although we're talking something in excess of 20 guns here. (9 to Kiirkell, 12 to Pratt, and something like 9 to MFL). It would be a well-informed spouse, indeed, that would be able to accurately account for that many guns.