I don't have a 360... or will ever care about it.
(I do have a PS3)
I don't have kids, but if I did, I would care about protecting them from predators, with that said I would never sign a stupid petition about "no porn", it is the parents responsability to oversee what their kids do (or might be in contact with).
game consoles are like any computer, and there are parent controls
precisely to protect your children, but you cannot blame microsoft because YOU don't use this controls.
this also apply to DVD/Bluray players, TV's etc...