But you don't know they're children. That's the whole point. A teenager, which most of these posts are, is not technically a "child".
Ignorance is ignorance. Who ever said it was synonymous with childhood? One can be a child without the pompous, self-assured, flagrantly misinformed idiocy that these 13-17 year olds roam the internet spouting off everywhere.
We're not making light of your precious grade-schoolers, Peter Pan. We're raging over the utter FAIL of teenagers who think they know everything and would just as soon rage at our informed opinions as we would at their bullshit.