Questions like these, which do not require or expect an answer, are called rhetorical questions. Because they are questions in form only, rhetorical questions may be written without question marks.

Should rhetorical questions have quotation marks?

Rhetorical questions can be ended with either a question mark, an exclamation mark or a period. Using a question mark is probably the most common choice, but it is really up to the writer to use whatever punctuation matches best the intent of the rhetorical question.

How do you punctuate rhetorical questions?

Depending on the context, a rhetorical question may be punctuated by a question mark (?), full stop (.), or exclamation mark (!), but some sources argue that it is required to use a question mark for any question, rhetorical or not. In the 1580s, English printer Henry Denham invented a "rhetorical question mark" (⸮)