Re: question mark or period?
Well, rhetorical questions -questions posed for rhetorical effect rather than for the purpose of gaining an answer - often don't end in a question mark. For example,
[1] Darcy points out that Mr Bennet has acted with impropriety, but does the reader have to agree with this statement.
=> Without the question mark, "but . . . ." means, Darcy can be pompous, so the reader doesn't always agree with Darcy's point of view.
[2] Her family doesn't always behave well, especially at the Netherfield Ball, but does he have to keep reminding her about it.
=> Without the question mark, "but . . . . " means, it's rude and utterly mean of him to continually remind her about her family's behavior.