My glider club just had our annual safety meeting, and one of the things we repeat every year is that it doesn't matter how new or inexperienced you are, if you see something that looks unsafe, call it out or put a stop to things if you think it's necessary. Doesn't matter if it's your first day at the airport, speak up.

I imagine the same thing would be true here. If you think the airport needs to be closed, then close the airport. Doesn't matter if you just got hired five minutes ago for the lowest position in the whole place, if you think the airport is no longer safe then shut it down.