Again, the media is very much NOT a "random source" of information. I don't know about the US but in many other countries (my own included) the media does have

Again, the media is very much NOT a "random source" of information. I don't know about the US but in many other countries (my own included) the media does have such a responsibility, even if many of the codes of conduct in existence currently are largely voluntary (though in countries less committed to free speech/liberal democracy etc. there are often quite strong penalties for publishing information that is deemed to be somehow unsafe for the public). Medical diagnosis was just one possible example, by the way, but I think you're very much mistaken that there's no likelihood that within our lifetimes we'll have good reason to trust and depend on it in that particular area.