I laughed quite heartily at the assertion that "most online strangers are adults pretending to be kids"
the truth is, it's probably the opposite.
and with the millions of people gaming on XBL, the number of actual predators probably accounts for less then half of a half of a percent.
those predators, as wrong as they were for soliciting minors (at least if they knew they were minors, they're stupid if they didn't know), probably weren't pretending to be kids to get access to said minors.
And as for "romantic devil", "wanna see my dick?" doesn't make someone a predator.. it makes them a moronic pervert perhaps, but that doesn't make them an evil person. They may have been a 14 year old kid that doesn't know how to properly manage his raging hormones.
Parents should be diligent with their kids, but they really really need to not worry about strangers. A kids uncle is millions of times more likely to molest them then some stranger they meet on XBL.