I don't know how many of the other ones realistically call for a bugout bag. Big storms have days advance warning - you don't need to be ready to leave at a moments notice, you need to decide days beforehand whether you're evacuating or boarding up your windows. Most civil unrest does not warrant evacuation in the United States, and if it got to that point, it would probably not be a sudden and unexpected departure.
Maybe I should clarify: In my previous post I wasn't so much against the idea that someone should need to possibly evacuate, as that you need to prepare to make a sudden and unexpected evacuation from society as a whole (like a "take the bugout bag and make a run to the woods" situation)
As for big storms- ideally, yeah, but it seems that a lot of folks try to ride it out, it ends up being worse than they expected, they get flooded out, and now have to be evacuated in a hurry.
Civil Unrest/War can also lead to folks fleeing their homes- see the massive numbers of refugees fleeing warzones. Staying in your home in such a situation may not be the wisest course of action.
Earthquakes as you mentioned can be another cause- also, tornados- but tornadoes are usually fairly localized.