At some point in the past, bombs falling on friendlies did kill the bomber pilot.
I know I poofed completely for no reason after dropping on an enemy airfield ( killshooter messages didn't exist back then ) on a couple of occasions.
Turns out, soon afterward, somebody was complaining about players dropping hangars at enemy fields and their solution was to park inside an enemy hangar, then, when the bombs came, the bomber pilot was kill-shot.
Not long after that disclosure, the code was changed so bombs didn't killshoot on friendlies anymore.
However, your own bombs can kill you, still.