[trashb]

Have you considered that even if unwanted material was only accessible in physical form with age restriction for buying. Like porn magazines, cigarettes or alcoholic drinks, kids can still access them and find a way around it. You can ask older generations. Perhaps you can't stop it by "going offline and raising them in a cabin in the woods".

Best is to assume they have access to it one way or another if they seek it. The discussion should not be about banning vs allowing, it should be focused around how to deal with situations that arise regardless.

Education about the subject and why kids shouldn't seek access is quite effective, additionally they will be informed once they are allowed access. Think about how the last decades saw a sharp decline in smoking and alcohol consumption.