There's nothing more deadly than a false sense of security: If you know your car is having brake problems, you can compensate by driving with extra care, increasing your following distance, and so on. If you falsely believe your brakes to be in good running order, you're liable to find out the hard way that they aren't (if you survive, you can thank Bruce Schneier for that apt and useful analogy).
I totally agree with this, and more…if you block normal pathways to access forbidden subject matter, then if your kid has half a brain (or friends with half a brain) they will figure out how to circumvent the filters in such a way that they will be swept out beyond the breakwater in the undertow of the Deep Web. Out of the frying pan, into the fire.
