But, maybe they were promised by the previous owner that their houses would always be safe, even if he sold the property.

Still, you would think one wouldn't be naive enough to believe something like that, especially if it ain't in writing.

I agree that these residents were short-sighted, but the article did say these houses have been in some of these family's possession for generations.

Sounds like they got comfortable and a tad complacent, and I can't really blame them if they've had the place that long.