Natural disasters aren't a great example, because we can and should prepare for them. As the saying goes, "earthquakes don't kill people, buildings do."
I lost my father as a kid because he crashed into a truck that broke down on a freeway in fog and had defective tail-lights. Maybe there is something he could have done, but what exactly could I have done? Mind you, I am not complaining at all, and I'd rather loose a cool guy than live with an asshole father. But I also saw people die of cancer, and not just the obvious "smoke, get lung cancer" kind. And I could go on.
I still agree with the blog post and loved it to bits. Simply because blaming others seems to be a default position for many (I know it often is for me), and it truly is a trap. Seeing it from another perspective is refreshing and vital. And it is always, always true (that it's our fault) when it comes to our inner state, to how we feel and think about what happens, and, last but never least, of how we treat others. Of that we are truly the masters -- but even there you could mention deception, (involuntary intake of) drugs or brain defects. So, it's not that simple.
Life can also be cruel and random and there is fuck all you can do about it other than suffer and/or die. Accepting that and still saying yes to life is kind of a superpower, too.
I think this goes to show that how much you have control over depends on who you are and what it is. The CEO of a company doesn't control everything but he has substantial control over the fate of the business. It's not helpful for him to dwell on things he can't control.
Traffic accidents are the sort of thing that, as a society, there is plenty that can be done to improve our chances that we're not doing yet. There are also a lot of things you can do as an individual to improve your changes (driving fast in fog is obviously a bad idea even though people do it all the time). But of course you can't control what other people do.
Natural disasters are a perfect example! You can plan and prepare all you like but in the end there are no guarantees that your planning and preparation will protect you. So if a natural disaster did happen and for the sake of argument you did everything within your power to prepare and did it perfectly yet still had something awful happen, is it your fault?
Consider too that natural disasters are not central to any number of locations. They can happen anywhere, any time, and come in any number of forms. You're not safe anywhere from them. That's why it's a perfect example. Because its something all people are prone to and that no amount of preparation can guarantee you safety from.
You are right that there is some randomness but they're not that random. There are warnings about hurricanes. Floods hit low-lying areas. Earthquake risk varies a lot based on region, soil structure, and so on. Some structures are relatively safe and others aren't.
But I think they're a good example of things that we can't always prepare for as individuals - it requires a group effort and that involves politics. There is a lot of resistance against, for example, attempts to stop rebuilding in known flood zones.
I would say that plane crashes are a good example. We can talk about the odds of being in a plane crash but they're not really random - there are always reasons. Also, there is a reason why commercial flights are considerably safer than driving. It's not because flying is inherently safer, but because as a society we put a lot of effort into making them that way.
Planning and preparing won't guarantee your survival, but it will sure do a lot to increase your odds. If person A spends hours meticulously testing his building's structural integrity and invests money to reinforce relevant safety mechanisms, while person B does not, is it person B's fault if their house falls down while person A's does not? No, it's not really, but they could have done more.
There aren't ANY guarantees in life (except maybe this one), but I think the point of the article is to try to show the benefits of an internal locus of control. There will probably be things in everyone's life that they have little power over, but that does not mean they are completely helpless. Rare is a situation where any action on someone's part has a 0% chance of changing the outcome.