Actors don't get paid just for performances, or for only the performances in which they deliver the lines perfectly. They get paid for rehearsals, costume time, makeup time, etc., and for the performances in which they missed their cue, came on stage early, left l

Creating software is a creative process, and there is rarely an end point where the software is completely bug-free, or where there is absolutely no further improvement which can be made.

Bugs are like flubbed lines. They happen. They always happen. And coders get paid for fixing them.

If your doctor makes a mistake, does he give you a refund? Or does he charge both for the mistake and the new fix? Your lawyer?