I will bomb tanks trying to storm or capture a base and they are getting too close for comfort (if there are no friendly GV's to defend).
I will also bomb spawn campers to break the camp if it is thwarting a capture attempt.
Otherwise, I will leave them alone to beat the crap out of each other.
Anti-aircraft GV's?
Bomb. Every time.
They are not there for a tank battle.
Bombing in tank town? Kinda lame, just as is spawning a flackpanzer under a furball, but easily fixed by someone upping an Osti or Whirble.
I will though, from time to time, take a fighter to tank town just to kill the griefers with bombs.
Bombing GV's just because you can is kinda lame, but hey, I pay my $15 and so does everyone else.