Yes, I totally agree the responsibility of the safety of children still living at home rests primarily with the parents.
Slightly more complicated however, when the parents are divorced or otherwise no longer together, even moreso if the Mom (who presently has physical custody) has some sort of friendship going on with the murderer and she doesn't see anything wrong with the kids having contact with druggies, a "former" child molestor, some lady who has a history of discharging shotguns inappropriately, and this murderer guy.
Reb you're totally correct about parental rights, at least in California (where Facebook is based), but to compel a monster like Facebook to do the right thing in situations like this? Pretty much hopeless, without millions of dollars in attorney fees, and even then it's a coin toss. Judges and the justice system in California generally are not known for protecting children. To them, kids are not a priority.
It sounds like you need to compel someone other than Facebook to do the right thing. It's not the only place your children could be introduced to such unsavory characters, seems to me you should be directing this towards the person doing the introducing.
Regarding Facebook and Paranoia
Society in general has taken a gigantic wrong turn in the past few years. I'm especially paranoid over this big obsession with Farmville on Facebook. Many of my facebook friends invite me to play this stupid game. I see this as far worse than being forced to listen to 70's Disco Music 24/7 for a week!
Farmville will be available very soon for the new iPhone. Get excited!
Can you just imagine a sea of humanity fussing with their iPhones doing virtual farming?!
I for one prefer working (farming) in a real garden. It's looking fantastic at this very moment.