the trick is discernment of what "information" is better left alonetrue, but mostly ignorance is just ignorance!
while my sons were young i told them that I knew they could view all kinds of stuff online say at a friend's house, including public beheadings, marines burned inside cages etc. I told them there was nothing I can do to keep them from checking these horrible things out, but I suggested they not.
what is seen cannot be unseen
(re: Human Centipede: I'm up for most anything in the make-believe entertainment world, but that entire concept gets a big nope from me)