Well it depends really, there is a big difference between 1 slow non maneuvering target and upwards of 200 slow non maneuvering targets. Albeit those 200 targets do have weapons. 208 rockets fired in the general direction of a bomber stream has the potential to fuck shit up.
Also it could be kind of scary to see a single fighter take out a dozen B-29 bombers.
In the late 40s/1950s, single bombers
were the primary target of the air launched FFAR systems, not squadrons in formation. With nuclear bombs the bombers would come in individually en masse, all using their own flight paths, so hopefully overwhelming the enemy air defence system with the number of individual intercepts to be plotted and serviced by the interceptors. Swarm tactics in other words, a bit more like the UK bomber streams, but over a wider front. Some would probably get through, and that is fine if they are carrying buckets of instant sunshine.
The rockets promised a single hit knock-out, and the ability to stand off out of the range of the 23mm tail guns these targets carried. However they did not work particularly well in practice - even using the sophisticated radar gun sights and analogue fire control computers developed for the purpose and firing packs of 100 or so of the things.
The Genie atomic unguided nuclear rocket was a solution to that, (and any bombers in formations as well!

).
http://en.wikipedia.org/wiki/AIR-2_Genie
Then reliable air to air missiles arrived with sidewinder in the mid 50s.
So the packs of FFAR fitted on USAF interceptors came and went rather quickly. Proper cannon replaced the pop-out trays of 100 or so unguided rockets.
The FFAR rockets then went on to be used as a worthwhile air to ground weapon in under wing pods. Ground targets are manoeuvring rather less than bombers, and not in 3 dimensions.