Brooks said:
Vader does not do anything aggressive to them, Han instantly draws his pistol and shoots when the door opens. How is that morally different?
You're asking on the wrong forum. I'm sure if you asked the right person, you'd get a nicely warped-to-fit-their-reality answer. Such as: Vader is actually the aggressor in that scene because he's force-choking a part of Han's anatomy that you won't really be able to see clearly until the 3D re-release.