Last tour,
B17 k/d .43
B24 k/d .32
TU2 k/d .30
Lancs k/d .23
Doesn't look like any buff is all that lethal.
Multiply by 3. A bomber pilot that does not land is 3 deaths.
Then take into account the huge number of deaths that are due to suicides and bomb&bails.
Then consider that bombers have a large population of noobs that will hold a K/D well below 1 if you put them in a Fighter. A noob in a bomber stands a chance to hurt a veteran player, while a noob in a Fighter stands next to no chance and takes a lot less ammo to kill.
The aove stats say that bombers are equal to fighters in player vs player sent to the tower.