The worst thing about widespread fake information is the ease with which you can convince yourself that everything you don't like is fake. We don't really have a defense against it that allows for people with opposing perspectives to coexist. I wonder if it's possible to somehow create a "consistency checker" that can check to see what claims are compatible with what other claims. Not a truth checker; that's far too…
Bad news: the political narratives of whatever party you don't like are self-consistent, and perfectly consistent with the facts that they hear about. The people you think are ignorant are already seeking out news from sources they know and trust, and they already evaluate new information in the context of whatever they already believe. The issue is just not as simple as you suggest.