Why do some locations need exorcising?

Why do some locations need exorcising?

Michele Kennedy (Exorcist) gives expert video advice on: Do exorcists rid houses of spirits?; How do I know if my house needs exorcising? and more...

Some locations need exorcising for a wide variety of reasons. For example, there could have been an accident on the land which means that people died and their spirits became trapped. The land could be cursed. Sometimes, it's not even the house that I'm going to visit that is causing the main problem. It may be, for example, a site down the road, such as one which has become contaminated in some way with a lot of negative energy and is affecting the surrounding area. I wouldn't just exorcise the location of the house; one has to examine the surrounding area and check for any contamination.