This is idiotology
When was an idealogical commitment to free speech a bad thing? Free speech is the underpinning of western democracies. China, Iran, Saudi Arabia, UAE, Maynmar, North Korea are the only comparable systems of censorship. The system proposed is not trivial and is certainly not suitable for a democracy.
There is no substantial body of indpendent, peer reviewed academic work to support the proposition that ".. people viewing pornography" suffer harm, let alone long term harm. If any such thing existed, the proponents of these schemes would be trumpeting wouldn't they?
Child abuse and child pornography is already illegal and is a law enforcement issue. The children harmed in the production and distribution of child pornography are not going to helped at all, ever, by censorship. I have no issue with parents controlling the internet access of their children. That is their decision as responsible parents.
It is the opinion of a small group of people that find the idea of pornography offensive that all adults should unable to view this material and decide for themselves. If you don't want to view pornography, make an adult decision and stop looking. It's a small step from a narrow view of pornography to political information becoming offensive and not suitable for adults.