I suspect it is the same reason that "auto repair theater" or "computer repair theater" or even "movies-that-are-garbage-but-pass-as-entertainment theater" stil

I suspect it is the same reason that "auto repair theater" or "computer repair theater" or even "movies-that-are-garbage-but-pass-as-entertainment theater" still exist. It is nearly impossible to be well-educated in every facet of one's life, and people need to pick and choose what they become knowledgeable about. Security is both a new enough topic that most people don't realize its importance and a complex enough topic that it isn't easy to really understand. Most people want to be safe; they don't want to understand security.