Why do so many people argue with nothing more than rhetorical questions? Can they not devise an actual argument themselves? Do they think that it's smug and clever sounding to phrase things interrogatively? Is it because they want take control of the debate by forcing you to answer (and often affirm) their questions?
On another note, there are those who simply deny or contradict everything that you posit, and they do so without offering adequate (if any) support/reason.
Heck, while you're at it, watch this one for fun.
Obama's Home Teleprompter Malfunctions During Family Dinner