They attack and fuck everything that moves. Being corrupted or demonified would just broadcast it to anyone who hasn't had the displeasure of meeting them. They are a prime example of quantity over quality.
I'm not disputing that they'd be less or equally annoying or that they couldn't spread corruption. I'm saying the minor threat they pose would just become a different type of minor threat. And everything threatens Hawkethorne. They clearly don't have a well-trained or well-equipped militia. But those effigies were just walking 1-ply tissue paper and the hornets outside of Azzy and the ones in the hive weren't that strong. Azzyran and the royal hornet family are outliers of strength. If Hawkthorne had a properly trained militia with proper equipment, then only the orcs, centaurs, and cultists would pose an immediate threat. Maybe Gweyr coming back can fix that, at least on the training front. And I'm in favor of giving the mercs a taste of their own medicine, steal their stuff, and run them off. That'd fix both problems. That said, helping them not get corrupted for Shar's sake and any potential kids is a good reason. Maybe not Zhara. She's just as bad as the other harpies.
TL;DR Harpies suck and are weak and corruption won't change that and we should help Sorra get rid of them so she can get better followers by attaching wings to things that shouldn't have wings. Flying pigs when?
