It is possible to talk oneself into being afraid of anything. It is very possible to talk oneself into distrusting any complex technological system, and gets easier the deeper one looks into the design, development, and testing of that system. The problem is, where does one stop? When is enough reanalysis and fixing enough? If the standard is, never, it must be perfect, be prepared to return to a world where you walk from your hut to your field and scratch the dirt with a stick. Until the blisters you get from using the stick break and get infected...