If you stop asking why too soon, you’ll miss the root cause.
In my industry we have a diagnostic tool called the “5 Whys”. It’s taken from Toyota because software developers like to pretend we’re in manufacturing.
The idea is that many problems have more than a single cause. If you treat the most obvious reason but miss the underlying system that led to the situation in question, everything’s going to break all over again.
A classic example would be a car not starting. Keep asking “why” until you get to the main cause.