eg. Voldemort’s problem wasn’t that he tried to extend his life, it’s that he was willing to sacrifice any number of other people in order to do so, a net increase in death overall.
Harry’s virtue wasn’t in being willing to die, it was in being willing to die in order to save others, a net reduction in death overall.
Voldemort’s problem in the original is absolutely that he tries to extend his life. It’s only due to the constraints of the story that life-extending stuff is usually inherently bad, but Dumbledore basically says that he’s evil for his belief is nothing is worse than death.
Rowling is a Protestant, isn't she?