Down the Rabbit Hole
Beyond all of this, if you really want to get adventurous, there's one more question you can ask: why did the developer write buggy code in the first place? Why was it possible for a bug to ever exist? Is it a problem with the developer's education? Was it something about their process? Should they be writing tests as they go? Was there some design problem in the system that made it hard to modify? Is the programming language too complex? Are the libraries they're using not well-written? Is the operating system not behaving well? Was the documentation unclear?
Once you get your answer, you can ask what the underlying cause of that problem is, and continue asking that question until you're satisfied. But beware: this can take ...
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