We associate developed countries to the word, "perfect." This is why many people are disappointed to see beggers and filthy streets in these "1st world" countries. What the nurse did is an human performance error. Administrative checks could have been placed for those errors to not happen, but they might slow the process down. As such, it is a mistake by a mere human, you cannot correlate that to a country being developed or not. Sure, you expect more care for the price you pay, but you always also realize that nothing is perfect.