A short-term curfew is a minor inconvenience. Something unexpected happened, and now you have to adjust your routines for a day or two. Being able to deal with such inconveniences without making them a bigger issue than they are is an essential skill for those who live in a society.

Chile has a history of looting after natural disasters. It also has a history of massive protests that often cause damage and sometimes turn violent. (The current president certainly knows, as he was a big student leader during one wave of student protests.) In a country like that, a one-night curfew is a reasonable precaution after a country-wide blackout.