[smac8]

One issue that separates software from most other industries is that software is not a physical entity. This makes the desire to change - refactor, add features, redefine use cases, etc - all the more tempting, since the only cost is getting someone to fix/alter some code (despite the fact that labor is obviously very expensive). In contrast, in aerospace for example, you have to get it right the first time, else you have millions of dollars worth of payload and equipment exploding. In these industries it means teams will probably be more reluctant to accept rapid change in development and deployment since the cost of failure is so much higher than software. This isn't the only reason for bugs in software by any means, but the sheer innate mutability of software makes the desire to pile on requirements, iterate frequently, and just generally not be averse to change a massive reason for buggy code