I think it's easy to be safe on myspace. You can put your profile to private, and easily just add poeple you know. You can then ignore any messages you get from people you don't.
Parents should teach their children how to be safe on the internet, and not let them go on if they don't know what they're doing.
So I really don't think myspace can be blamed. If kids are going to talk to strangers and meet up with them alone, the website can't do anything to stop it.