Probably not Karnak, but a competent buff pilot can manuever so that the "sucker" has no choice but to come up and face the tail guns.
As a general rule, I don't geekdance. I make course corrections sometimes, and I'll turn 180 degrees on the various bombing runs, but I don't sit in the tail gun station and fly the buff to make sure that the enemy has to come up my 6 if he wants to attack me.
You are right though, most of the time they just fly right up your 6 anyway.