The difference, Teleman, is that your bomber is either hitting a Complex or getting shot down by an Infantryman defending at 2.
AA Gun: 1 Shot @ 1
Infantry: 1 Shot EACH @ 2
Far more dangerous to attack infantry for hte 3 IPC. Senseless to leave them sitting around doing nothing.
Also, as mentioned, the bombers are working around the clock for you.
1) If you attack the territory, you have to pound through the bombers before hitting the infantry, artillery, armor and fighters. That could significantly shift the battle out of your favor thus negating your attack. (And of course, there’s no assurance you’ll get the bombers either, your opponent could take infantry instead.)
2) They are preventing your opponent from moving their fleet in range, or at least, making them shell out cold, hard IPC for more surface ships to protect their fleet.
3) They can serve as paratrooper units, forcing you to bloody well defend anything within 1 to 5 zones from an enemy territory and thus, watering down your forces.
4) They can be upgraded with LRA forcing you to defend anything within 1 to 7 zones and/or heavy bombers forcing you to beef your defense of said territories.
5) They can be used for SBR campaigns
6) They can be used to assist in battles
7) They can prevent your enemy from even building a fleet.
And that’s just the surface of it.
As A44 said, it’s best for America. My best games so far have been with America buying nothing but Tech, Infantry and bombers. (in no tech games, just bombers and infantry. The infantry defend N. America, the bombers remove Germany and Italy from the game militarily so that England can build up in Russia and Russia can pound down Japan.)