I was reading the FAQ so I know what'll get me banned, and I read the whistle section. It said that people with a garbage whistle(me, even though I never tried to flag anything...)can't flag anything. That got me to thinking. What if the user actually found something against the rules and wanted to do the right thing for a change? They won't be heard. (whoever guessed that gets a cookie) So if it's like CP or mutilation or something, it might not get deleted. (You know, because of the DD and KK and those guys...) Because unlike the Presidential Election, every flag counts.

tl;dr
People with garbage whistles can't help. And a lot of people have garbage whistles.