Years ago, before "domestic surveillance" (oops, am I on the list now?) was even in vogue I had a friend who was concerned about it. Borderline tin-foil hat type, but with a twisted sense of humor. He set his tagline/signature for *all* of his emails to be something like "For my friends at NSA: nuclear Soviet Union submarine ..." Wonder whatever happened to Dave, he disappear a few years later...
The words on the list also have to appear in context with other suspicious words to get flagged.
i.e. A phrase that contains “shopping” and “Target”
would not be flagged. The word “shopping” and the fact that Target is capitalized would mark the phrase as innocuous.