Our greatest strength as a species is likely our ability to adapt to our enviroments. The abnormal becomes normal when given enough time.

Beside that, even when under dire circumstances, many people can just kind of find it in themselves to keep laughing and keep hoping. You find joy where you can when you have to and, as long as they believe there is a life ahead of them, many people will continue to seek that joy, however miniscule. We are highly resilient in many ways. Sometimes for the better. Sometimes not.