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If the user can write to it, the user can overwrite it as a totally empty file. Is this any better than deleting it? If not, then you'll still have the same problem whether you somehow deny deletes...

Correct. Who the files belong to seems to be irrelevant, only the directory bits are considered when deleting; even a file owned by root, set to 000, can be deleted if I own the directory and have...

Not that I can see. This changes the way I look at UNIX file permissions a bit.