Question: Why stop at just blocking up a death hogan and knocking a hole in the wall? Why not destroy the structure, just raze it to the ground? Is it the structure itself that the spirit attaches to, or the real estate it stands on? And, in the case of the convenience store (I think that's elsewhere in the thread), would the situation change if the store were to be replaced with some other structure?

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It is hard to convey five-dimensional ideas in a language evolved to scream defiance at the monkeys in the next tree. -- The Science of Discworld III: Darwin's Watch, by Terry Pratchett, Ian Stewart & Jack Cohen