We humans are hard to deal with. We are a loud, complex and demanding bunch. Often, we are best dealt with from a safe distance and for only brief periods of time. This could be why a lot of marriages fail.
I don't want to fail the audience. I don't want to let them down.
Creativity requires a lot of pass/fail/start again and it is often hard on the psyche.
I have to do things for myself, and if those standards are set high, then it's up to me to pass or fail.