Developers may not be open heart surgeons, but in some cases, it's even worse. The human body can heal on its own, and leaves ambiguous traces of the work done.

Developers may not be open heart surgeons, but in some cases, it's even worse. The human body can heal on its own, and leaves ambiguous traces of the work done. Bad bits on the other hand continue to infect the system, a "tiny" security hole in the wrong place is as bad as a systemic infection.