The solutions proposed don't understand what can and cannot be verified. You can verify if a statement is actually from the source subject to the messy details

The solutions proposed don't understand what can and cannot be verified. You can verify if a statement is actually from the source subject to the messy details of distribution. You can't verify the actual truth cryptographically. Ans ot encounters the same messy problems as computer security - no matter how good your technology you can't have both power to the user and protect from absolute idiots - see phishing. An authority signing it only tells you that it was approved by one and not that it is actually valid. Transparency enabled by the internet and sousveillance (for instance every camera phone capture of police brutality) makes it clear that the idea you can trust and rely upon authorities is a flat out lie.