Character Analysis
We don't spend much time with Charity in this film, but we quickly learn the details of her history from Voldemort while she has her imprisoned in Malfoy Manor:
VOLDEMORT: To those of you who do not know, we are joined tonight by Miss Charity Burbage, who, until recently, taught at Hogwarts School of Witchcraft and Wizardry. Her specialty was Muggle Studies. It is Miss Burbage's belief that Muggles are not so different from us. She would, given her way, have us mate with them. To her, the mixture of magical and Muggle blood is not an abomination, but something to be encouraged.
So, yeah, she loves Muggles. Clearly she must die?
Well, as Muggles ourselves, we obviously don't agree, but we aren't calling the shots in her case, sadly. Voldemort kills her and then gives her body to his snake, Nagini, as a snack.