> And there are some other restrictions which just seem more like theatre, such as curfews. Do we think coronavirus is nocturnal?

The way I've heard some people explain it is that human behavior changes nocturnaly. After 10pm what are most people doing out? Nightlife and drinking overlap pretty heavily, social drinking and social distancing are kindof contradictory, and alcohol isn't known for increasing people's capacity for conscientious observance of safety practices.