We get occasional questions from people with no aviation or engineering knowledge, who have a "great" idea about how aircraft should work differently, whether it's issuing parachutes to passengers, putting CRTs in the cockpit to defeat laser strikes, or anaesthetising passengers.
They tend to go the same way. They get downvoted mercilessly, someone explains in the comments why it's a bad idea (or why it's a good idea but infeasible for non-obvious engineering reasons), and then the questioner says "but what if ...?"
To me, this last part is the sign that the questioner is not really asking a question, but looking for a discussion. From the "help center":
If your motivation for asking the question is “I would like to participate in a discussion about ______”, then you should not be asking here.
Should we have a specific policy about these "armchair engineering" questions? At the moment, it seems pretty random whether they get closed as "unclear what you're asking" or left open, and they almost always get a negative score, and they often lead to several low-quality follow-up questions (the laser strikes series of "questions" being a prime example). I think the current situation is unfair to new visitors, because they don't know what to expect from the site, so they have no reason to expect a negative situation; and unhelpful to the regulars, who come for serious questions from aviators and enthusiasts, but find a front page full of unanswerable questions.