I think none of the things you mentioned are black swans--market bubbles have popped before, banks have frozen before, bail-ins have (I think?) happened before--but I agree that 'impending catastrophes' is a category of things one would like to have the earliest warning of.
The low-probability piece, though, is not the news source but the ability to interpret the information better than everyone else. It seems to me that for the areas one knows well, this probably falls into 2 and 3--if you run a company that depends on online software, you should probably be paying attention to sources that will give you early warning of security issues. But will you be any better at interpreting political news than anyone else? And is the 'political risk insurance' worth the cost? (You pay attention and time periodically, in the hopes that you will lose less if something goes wrong.) Certainly everyone agrees that it would have been nice to have insurance when something goes wrong, but that doesn't mean it's a good idea looking into the uncertain future.
the ability to interpret the information better than everyone else
I don't think it's necessary to be better than everyone else. You only need to be better than most and that's not a particularly high bar to clear.
For example, look at the two recent financial crises in the Eastern Mediterranean: the Cyprus bail-in and the Greek bank freeze. Clearly some people saw it coming and got out; and clearly some people sat there twiddling their thumbs and going err... maybe... I dunno... my neighbour says it's going to be fine... -- and those people got caught an...
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.