MTBF gets ya in the short hairs ..eventually, when a cosmic ray hits a junction and your missile hits a bunch of Nuns in a crosswalk; it's allus like *CRC [not That CRC] when purest digital-think overrules Knowledge of da homo-sap's ∞ ability to do stupid shit..
* what was that stat of %-times when the error is IN its own check-sum?

Rest case: Chaos always nullifies Wisdom.. mostly. :-)