Truth is not Truth by itself, it is necessary to establish it as such, it is not enough to nod to it, nor is nodding to it the way to establish it. A person may be before the Truth but if he does not establish it for himself, and in his environment, the person continues to live in the lie of ignorance of God.
It is the message born of conviction, of the personal conviction that God revealed Himself and spoke, and that his instructions do not need interpretation,
The main reason why the darkness is established in one place, and cannot be removed from there, despite the prayer of the saints, is because the people of faith ignore that there is a biblical protocol to expel them from the place.
Now, it is important to point out that the faith communities of a place, or a region, are the only ones responsible for what happens in their region.