This is exactly the question that the parable of the broken window answers.

http://bastiat.org/en/twisatwins.html

I wouldn't say exactly because over-staffing does not entail destruction like window smashing does. Overstaffing entails significant training and break time while on duty. Time to train, break and help other departments is considered a premium quality of creative working environments. Factory style production environments that are goal focused are a special case of keeping workers running, best when its to finish early.

"Creating jobs" is a silly argument. Literally anyone can create jobs if they are useless. Here's a shovel, go dig a hole then fill it back in.

> Here's a shovel, go dig a hole then fill it back in.

That's ... actually how it's done, yes. Besides dam construction the https://en.wikipedia.org/wiki/Maschsee is a nice example of literal hole digging.