Should we require that questions be requests for information, feedback or discussion rather than merely a platform to state one's own opinion on some topic?

Fluther has explicit standards for both questions and answers.
If a question is clearly rhetorical, that is, posed as a pretext to state an opinion, rather than to ask about something they really want to know, should that be a basis to flag the question?

While we all have opinions and beliefs, these are not reasons to ask a question. If you want to promote a discussion on a topic, would it not be better to be allowed to do that, instead of crafting an disingenuous question as a pretext to do the same.

Promoting discussions can be a valuable things to do. Why can we not just do that instead of asking a question when we are not really looking for information or advice?