We do not insist upon the full "goat-sacrifice" approach to updates. Some people recommend rather elaborate procedures: back up before updating; both before and after updating, clear caches, repair permissions, and run DiskWarrior; and so forth. None of this is likely to do any harm, but if updating is made overly complicated, users won't do it at all or, even worse, will just be confused.
On the other hand, it is reasonable to accept the premise that Apple's Software Update, as presently implemented, is inherently dangerous. An application is going to download important system components and … Read more