Do you blame Grethe for what she did?
From a number of the comments posted in other threads, it seems many viewers blamed Grethe for being evil or nasty.
I see it a bit differently. First, let me say that I came to seeing it this way by asking myself how would I have reacted if I had been in Grethe's position. And how should I or any reasonable person have reacted?
I think almost everything Grethe did was right, up until the point at which she basically self-convicted Lucas solely based on her erroneous belief that children never lie (by which she apparently also meant that children also never are confused about things and never misinterpret situations) and she told him to leave and never return and wouldn't even talk to him.
But prior to that point, I think she did what most reasonable, well-meaning people should do. She brought in a supposedly outside party to try to interview the child. She put the accused person on leave and notified the authorities. And she notified the staff and parents that an accusation had been made and that an investigation was underway.
The way she later treated Lucas - and Nadja - though, was wrong. As were the ways the townsfolk behaved toward Lucas and Marcus. But prior to those actions, they were all just victims of a series of tragic misunderstandings for which no one was really blameworthy.
(edit: previously wrote "maria" instead of "nadja")