/s
/s
For some people including your parent perhaps, it is axiomatic that free information implies an abundance of false information.
The construction was a little strange. "If only..." usually references an existing technology ironically. In this case I think they are saying there will never be such a tech.
The problem is that it is possible to do, and the solution to it is not something we want in general, but we're heading towards it anyways, and TBL is trying to avoid that with his machinations, and the commenter is effectively asking "how does this solve a problem that would naturally be solved with a solution we really, really don't want, and TBL is going out of his way not to solve?".
I know which I'm more afraid of...
Another option is accountability, requiring a confirmed identity to be disclosed with any posting. If people knew who was behind fake news, it would potentially be less damaging.