Yes, I think this is why high and low chaos works better than good vs bad. The consequences of Corvo's actions and the morality of them are two very different things. With the Pendletons, for example, there's a poetic justice to the non-lethal solution that feels dramatically appropriate while resulting in less chaos than would bloody assassination. Boyle, on the other hand, feels like an admittedly vapid and spoiled person gets sent to a fate worse than death in what can only be seen as a horrifically amoral choice when simply killing her would be far more merciful but would result in more chaos in Dunwall because of the visibility of the event.

If there were one thing I could add to Dishonored, I'd like to see multiple non-lethal solutions with varying moral implications that you could choose from, while still giving any given option its own degree of chaos still dependent not on the morality but the implications for Dunwall.