Well, not now, not anymore. At the beginning, maybe.

Typically, when a spirit attacks a human there are two possibilities to make it stop. You can try to appease them by solving whatever problem they have or you can exorcise them. But now... this is a problem entrenched in generations of people. A simple exorcism won't do. You'll need more than that.

[And is is really strange....]

Why didn't they do that right away?