[tantalor]

How can it possibly be both "basic functionality was not working" (high severity) and "no suspicious transactions had slipped through" (low severity)?

[Harvey-Specter]

Pretty easy to understand if you swap what the software is detecting to "asteroids which are on impact course with earth". Basic functionality is to detect asteroids which are on a collision course with earth. The fact that no undetected asteroids struck earth doesn't mean the software worked or didn't work, nor does it mean that detecting asteroids which are on a collosion course with earth is not basic functionality.

[giarc]

Absence of evidence doesn't mean evidence of absence.