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Just because an obscure idiomatic usage exists doesn't make it incorrect to use the words literally.

If cats and dogs were falling out of the sky, I could correctly say that it's raining cats and dogs.

Some situations beg for a certain question to be asked.

This is a little pedantic, but "begs the question" doesn't really mean "raises the question" even literally. It sounds weird to say that someone "begs a rebuke" when they really deserve a rebuke. Even more literally, you don't say that someone on the street "begs a dollar" -- they beg for a dollar. Just as you said, some situations beg for those questions to be asked (or perhaps they beg that they be asked); they don't simply beg them.

Not quite true. "I beg your pardon" and "I begged her forgiveness" are standard English.

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