It did conclusively demonstrate that hoary old maxim of military doctrine: you are best prepared to fight the last war. The "giant mess of unguided rockets" school of air-to-air combat pretty much ceased afterwards: As a result, by the late 1950s it had been largely abandoned as an aircraft weapon in favor of the guided air-to-air missiles then becoming available. The Mk 4 found other uses, however, as an air-to-ground weapon, particularly for the new breed of armed helicopter. A volley of FFARs was as devastating as a heavy cannon with far less weight and recoil, and in the ground-attack role its marginal long-range accuracy was less important.The Mighty Mouse was to prove a poor aerial weapon. Although it was powerful enough to destroy a bomber with a single hit, its accuracy was abysmal. Its spin rate was not high enough to compensate for the effects of wind and gravity drop, and the rockets dispersed widely on launch: a volley of 24 rockets would cover an area the size of a football field.
The hilarious part is that none of this shit is empty sky. Take a look at the turf and recognize that there aren't a lot of good options. Newhall is effectively Santa Clarita. That means they didn't want to blow it up over Simi Valley or the San Fernando Valley, all of which are chock full of people. I've been (I've shot television!) at every location listed and opting to fire 200 rockets over Newhall is kind of the equivalent of opting to fire 200 rockets over... well, there's more people in the San Fernando valley than Edmonton. By a million.