I read through all 655 posts I did see all arguments or suggestions but I believe we got the situation wrong.
No one with a urge to pornography will stop by just using a filter no matter how strong the filter is or how non-technical he is, he will get around, a filter is designed and made for the purpose to help a person prevent from getting access not acceptable to him, while for some it's pornography while for others it social media everyone to their level, with a variety of products he should be able to choice a solution custom tailored to him.
K9, Meshimer, CovenantEyes, Vocatech, NetNanny and others they are all best choices for the right person depending what you're looking to accomplish, no enforcement or agendas will accomplish anything, the education and willingness from each individual person looking to be protected from the Internet using a variety of products available today should work.
Not every car safety prevention is good enough to satisfy each individual person, but with a variety of different cars and safety products it will fulfill everyone's needs, Internet filtering is no different arguing one product over the other is nonsense while for someone it may not be good but for others it's the best choice.