If friendlys aren't around, I let one bomber go. This way I know the guy is occupied flying home rather than launching another box of buffs immediately. This break may be all we need to resupply the base.
Because it's not in the culture to play the right way in terms of the war there are plenty of times I will bail after bombing a strat.
For example, last week I went with 2 others and bombed the ammo factory of a country who was hording and had taken a base in our territory after taking back a half dozen of their own. To prevent a horrible night of defending against the horde I made the 1.5 hr 1 way flight deep into their country at 34k and fought my way in. Having dropped all ords, killed the last fighter, and called on country to pork the front in vain I bailed and porker it myself. I do this sometime but I never bail if someone upped for a fight No matter what condition my planes are in because they deserve it.
With that said I have no problem bomb and bailing if no one else is going to do what's needed. I just refuse to cheat someone out of a fight If they earn it. If I see a dar bar near me I wait until it passes. Never turn down an opportunity to fight and learn something. I know I'll get flak for what I said but it's my $15. Score isn't important to me these days. Someday it will be bit right now my goal is to make as much of an impact on the war effort as possible and I do that well.