simply by 'accidentally' going to the wrong website, be exposed to imagery that really is not going to help them be well-adjusted in life, without any safeguard

simply by 'accidentally' going to the wrong website, be exposed to imagery that really is not going to help them be well-adjusted in life, without any safeguards in place, there is something wrong. The worst of the worst content perverting a well-adjusted life come from popular, generally SFW, mass-media outlets. If the goal of web filtering is for a well-adjusted life, put the firewall in front of sensationalism, fear-mongering, outrage-bait and hate-mongering. Or, in other words, block all blogs, news, and clickbait sites. Porn can get through though. Sure it's taboo, but society as a whole is much better at understanding it does not represent reality.