What is it about the cause of an event and the trigger of an event defies people's comprehension. You can sit in a car but it will not move until you start it.
You can pull an elastic band until it snaps, you can put a match to it, you can cut it with a knife.
The rubber band is in a stressed state for whatever reason and then the stress is released by the triggers mentioned.
What is so difficult to understand about these two discrete concepts?