Now, this is not only a hilarious clip from the Daily Show with Jon Stewart... it also points out a figure of speech that writers must avoid.
If "phrasing a statement like a question to cover your ass" is a stupid trick on FOX News or CNN, then it's also a stupid trick in fiction:
"Was Blast Hardcheese a fifth column for the Thesaurians?"
"Had the whole sequence of events been masterminded by Aunt Petunia's poodle?"
"When she cried 'No, no' did she really mean 'Yes, yes'?"
Just. Don't. Write. Rhetorical. Questions. You don't want to sound like a talking head on TV.