"As far as "Quite why people obsess about current events that they have no actual control or influence over I have no idea." goes, I agree 100%."
Speaking for myself, I give myself two reasons for why I care about these things, even though I can do nothing about them and I might be happier if I didn't. The first is that we've often been told that we can actually do something about them, and some people are able to do it by spending lots of time campaigning or organizing people. I am not doing either of those things because I'm often working, doing other things I've already committed to, and when I'm done with those, I'm tired, but since I know that I am technically capable of doing something, it seems like I should at least know what's going on so I can decide to start doing that if it ever comes up.
The second reason is that I've seen the kind of people who actually manage not to know about current events, and in large part I don't want to be like those people. They mostly fall into two groups:
1. People who know nothing about any event you might bring up and are apathetic about it all. It doesn't matter how local an issue, how much they could actually do about it, or how much it might affect them. You could tell them that someone is about to close their street unless just one person asks them not to and they would be blase all the way until the street was closed and they were confused why this would happen with no warning.
2. People who don't know about any of this but decide to have strong opinions nonetheless. The French are evil because something Sarcozy said about the British being inherently malicious, and when you point out that Sarcozy probably never said that and he hasn't been president of France since 2012 anyway, they don't seem to mind or they insist that your facts are equally reliable as their assumptions.
Why the existence of these people should make me read about all these things is a good question. After all, just by knowing these things, I'm not reducing their numbers at all and it just makes it all the more annoying when I meet one. Still, that is one reason why I instinctively want to read about any sufficiently large event or one that's likely to impact something I might interact with, even when I can't do anything about it, and so far, I have not gotten over that instinct.