These arguments never quite make sense to me.

The reasoning appears to be "since technique X can cause problems in some circumstances, it can never be used in software for domain Y (usually avionics, space, or similar)".

However, obviously every technique could cause problems in some circumstances. Therefore I conclude it's impossible to ship software into space.

Since software clearly is shipped into space, it seems likely there is some problem with the above argument. My suspect is the "could cause problems? Can't use it!" line of reasoning is oversimplified for the purposes of explanation, and hopefully something better justified is actually occurring.