You have a point, and I don't necessarily disagree with it. Veronica doesn't think Lilly deserved to die, and thus the audience doesn't. The implication that she might have thought Thumper deserved to die is a specific character trait of Veronica's, just as accepting Weevil's hand in Thumper's death as The Way Things Are would be. But I wonder if that's something that will ever be addressed, because it is still a bit unsettling. What I mean, I guess, is I wonder if the show will ever question Veronica's shifting moral values in any sort of direct manner. I really hope they do.