DMG articles?

Well, that works if the only vector of misinformation is broadcast-based, but it's not. There are far fewer gatekeepers now than there were last century, you don't just have to fact check what comes up the traditional media pipe, also social media claims and claims from marginal sources. Both of which look pretty much identical to traditional media in the forms that most people consume them, which is a big part of the issue.

And, of course, anonymous sourcing and source protection still has a place, it's not as trivial as that.

In any case, there are no silver bullets here. This is the world we live in. We're in mitigation mode now.

With respect, this shows an ignorance of the historical role of journalism in democracy.

to cite sources

Sources may have valuable information to get out, but not be willing to go on the record. Professional journalists are like doctors in that they've committed themselves to a code of ethics. As citizens we are called on to trust them to not make sh*t up.

For publicly available written sources, it's only a bit different. Yes, they could cite every sentence they write, and indeed some do, but it still comes down to institutional trust. If you don't trust where you're getting your news from, this is a problem that's probably not gonna get fixed with citations.

make them liable if it turns out to be false

A terrible no-good idea. Legislating for truth is a slippery slope that ends in authoritarian dystopia. The kind of law you are advocating exists in a ton of countries ("spreading dangerous falsehoods", abuse of defamation laws when the subject involves an individual, etc). You would not want to live in any of these places.

Well, I don't know you personally. I'm saying anybody who has to fact-check the uncited claims made in news articles, and thus is an acting journalist is statistically very likely to be extremely unqualified for the job.

Which explains a lot of how the 21st century is going, honestly.

Yes it would. As would the almost certain fact that you personally choose not to actually pay for journalism, despite criticizing it liberally.