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The reality of most software development is that the consequences of failure are simply nonexistent.

When I write software, I know that it will fail, either due to my own mistake, or due to some other cause.

In short, software is eating the world.

Software as an asset isn't stable over time; it needs to be maintained.

In the practical world of computing, it is rather uncommon that a program, once it performs correctly and satisfactorily, remains unchanged forever.

Software is like entropy. It is difficult to grasp, weighs nothing, and obeys the second law of thermodynamics; i.e. it always increases.

Software comes from heaven when you have good hardware.

There is a constant need for new systems and new software.

I'm not saying we purposely introduced bugs or anything, but this is kind of a natural result of any complexities of software... that you can't fully test it.

However, writing software without defects is not sufficient. In my experience, it is at least as difficult to write software that is safe - that is, software that behaves reasonably under adverse conditions.