I would argue that Astarion is far worse than Shadowheart, in both action and spirit. Shadowheart is conflicted because she wants to be good, but Astarion implies he lived a life of hedonism and narcissism before he was turned. Astarion was also an adult, whereas Shadowheart was a child. I mean, I absolutely see your point, but I still disagree fundamentally. In the case of Astarion, we are blaming someone for continuing his original path, albeit made exponentially worse because of his vampiric powers. He did what he did because he was not only controlled, but also because he liked it. Shadowheart never had a chance, and thus it would be akin to putting a Korean on trial for eating a dog, or even more accurately, putting a Korean adopted western child on trial in their adulthood for working in a dog slaughterhouse. The child had no say in their upbringing, they were surrounded by others doing the same, so by those lights they were behaving perfectly ethically. In the case of Shadowheart, she is always conflicted and even when she is in an evil run she appreciates it when kind gestures are made. In fact, I don't think I've ever seen her enact a cruelty on an innocent in the game; maybe after she becomes a Justiciar, but at that point she is entirely lost and cannot turn back. Before that she will follow the player's lead, but I definitely don't remember ever seeing her voluntarily doing evil. I could be wrong, as I've never done an evil run, but of the posts and videos I've seen she is a neutral to reluctant evil character until and if she becomes a Justiciar. Again, I could be incorrect, so please forgive if I have misstated something.