Fourgolds - I'm not sure if you're being deliberately 'Devil's Advocate' or not. Sadly, I think you're serious. Not one of us in this job could possibly say that they've never made a mistake - certainly not me.
When someone in the crew picks up another's mistake it simply emphasises the 'crew concept'. After the apologies, the guy pointing out the error normally sais something pleasant like 'That's why there are 2/3 of us'. Beers are bought and the sin is added to a growing list of 'Musn't EVER do that again!'
That's why experience is so important and valued. The list is long. Beware the pilot with a SHORT list because he may have a BIG ego!
My whole point earlier was that some errors are simply not acceptable. We can all think of what they are.
In my opinion, TWO people in a serviceable aircraft who 'as a crew' take off on a taxiway in good weather at a familiar airport should GET ANOTHER JOB.
I'll say this - it's not 'There but for the grace' at all. It's DON't DO THAT!!
Thanks for the support Fooey and others. Keep those mistakes a'comin'!