Did you all think Leia had forgiven Vader? Or did you not think anything of it? I was reading wookipedia cuz I'm just so damn awesome and found out that Leia didn't forgive her father until after ROTJ, I mean he did kill her foster parents and everyone on her planet without mercy and he also tortured her for information.
Well since Luke doesn't seem to tell her anything about what happened with Palps and Vader on the Death Star, she probably didn't know that Vader turned back to the light until after ROTJ, which makes it logical that she couldn't forgive her father until she actually knew he had saved Luke.
I think maybe afterwards luke had told her, she knew her father had turned back to the light side but she still struggled to forgive him, but after I saw ROTJ I thought all was ok with the skywalker family but I guess not
Technically, Tarkin is the one who gave the order to destroy Alderaan. If Vader would've had that kind of juju on him, then it's likely that Leia wouldn't have been able to forgive him regardless of him saving Luke. Luke = 1, Alderaan = billions.
"A great tactician creates plans.
A good tactician recognizes the soundness of a plan presented to him.
A fair tactician must see the plan succeed before offering approval.
Those with no tactical ability at all may never comprehend the plan, and will resent the tactician."