These "issue traced to staffer" stories sound like management cover up for management/system shortcomings to me. Systems with such significant potential impact, and in industries where lack of financial investment in their continuity is a deliberate choice have very little excuse to be passing the buck to grunts for basic process flaws that can be triggered by individual error.
I had a project that was really important once. I made a tiny mistake that had a big consequence - a couple of hours of potential lost revenues from our customers. I fixed my mistake with both my boss and CEO nearby. I said after I pushed the fix that I really need more resources around it. That little light of "yeah, this is important" that should have flickered didn't. :) I will not be surprised if nothing gets fix…
You're reminding me of the difference between engineers and non-technical managers; to many of the latter something's only a problem if/when the customer or senior mgmt are on the phone complaining about it. Until then it's all naysaying engineers being too pessimistic about process and risk.