The error had been mine, of course. That was just how things happened, whether the error was actually mine or not. Culpability tended to run downhill... similar to avelanches or excrement. Still, even though the calculations had not actually been my doing, I should have had the forsight to double possibly and triple check the captain's course, knowing as I did about bodily waste and hills, even in space.
If the calculations were not my fault, the lack of ass-covering, given the nature of my job, was. So, in that sense, I DID fire the shot that ddestroyed the Earth.