An appeal to authority is not a fallacy if their expertise is recognized and there is strong consensus. How many countries haven't signed and or ratified?
How was it decided what should go into the Convention on the Rights of the Child?
The standards in the Convention on the Rights of the Child were negotiated by governments, non-governmental organizations, human rights advocates, lawyers, health specialists, social workers, educators, child development experts and religious leaders from all over the world, over a 10-year period. The result is a consensus document that takes into account the importance of tradition and cultural values for the protection and harmonious development of the child. It reflects the principal legal systems of the world and acknowledges the specific needs of developing countries.
Your opinion, whilst worth listening to, is of little consequence because (excepting the US) everyone has ratified. They are all legally bound to adhere to the convention. Even the US must not be seen to be going against it.
I put it to you that the states parties must be making sure that kids can go on the internet and be safe from porn.
Access to all that is beneficial on the web is a child's right.