I'm not bothered by the harpies - as far as I know, they're as much a part of nature in the Realms as any other predator, and I don't think the druids had any reason or responsibility to chase them off. Obviously at least some of the refugees were informed about their presence, otherwise the boy wouldn't have been in that spot.

I am a little bothered by the hag down the road, though. She seems to be up to some unnatural shenanigans, and she can be found just sort of casually hanging about. Too bad we can't mention her to Halsin.