...Preventative work.

[There's something in her that initially rebels at the thought of retaliation at all, however it may be framed, but as Alucard starts to tease out his notions into fully-formed thoughts, she starts to see where his ideas are leading, and the foundations upon which they're resting. Still vengeance, yes, but with an angle to it that comes from a place of wanting to do good.

Not everyone has the luxuries we do, he says. Because not everyone has a moving castle to flee to and the denizens of darkness at their beck and call. Women before her have surely been dragged out as witches, and had no supernaturally-gifted sons to come running to free them. So what happens to the families they leave behind? The only route open to them is weeping, and standing by in their horror.

Her son. He doesn't want to just save her; he wants to save every other condemned so-called witch after her, too.]

To do that, you won't be able to stop at just one church. It would have to be every one of them. None left untouched, and no room for dissent.