The Harry Potter universe has always been a world where actions have direct or indirect consequences. For example, because of the choices Hogwarts' headmaster Albus Dumbledore made while trying to find a way to see his deceased sister even just one more time, he ultimately cursed himself to an early grave. However, in his final acts, Dumbledore's sacrifice sets Harry Potter up to defeat Lord Voldemort. The same could even be said for Voldemort, even if the consequences came at the cost of his humanity, both mentally and physically.
Source：https://www.cbr.com/voldemort-nose-what-happened-harry-potter/
