Q: "Why the F*** is it SOOO G*dam*d hard for Parents to Parent there Children?
Keep the Computer in a place where you can monitor what your Kids are up to while on the Computer."
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A: It's possible, though surprisingly difficult, to monitor the computer use of your own children. Try, for example, watching the use a 5-year old is making of the computer whilst the 12-month old, who has just mastered crawling really quickly, is sampling the joys of "pulling himself up on the table where you've just put down the chillis in order to answer the door."
No, the real problem comes when they're old enough to go round to their friend's house without you being present all the time. Or even swapping information in the playground. At that point you're dependent not just on your own parenting skills and standards, but that of the parents of all the other children in the school. And it's not just the parents of the children to whom your children are talking / swapping pictures - it's the parents of the children that those children talk to.
Once they get to 10 years old, you have to start insisting on really strict, "who you may talk to" rules and sending them to religious academies where they'll get really unpleasant consequences for using naughty words or expressing unacceptable opinions. And THAT'S a cure worse than the disease.
Otherwise you have to opt for home schooling and social isolation and there are not that many parents - at least in the UK - who are prepared to go down that route.