I don't think she's going to be able to avoid being a shitty Death Eater for long, and we don't know what they might make her do, one way or another. And so, I guess I'm looking at it like, taking her out of the equation means they have one less person at their disposal. We have ways to find out if she's really spending these days murdering people, right? And we can use that when we turn her into the Ministry one day? Make her face that, too.