tzadik vra lo rasha vtov lo. This isn’t a new issue. Hakadosh baruch hu as a dayan takes in a lot of factors such as how a persons life or death affects the other people in his/her life and people can be kept alive even if just for the purpose of being mehane a tzadik for one second. there are a lot of more complex answers – i would suggest looking in sifsei chayim from rav friedlander zatzal for answers as he uses more contemporary language/themes to explain difficult hashkafic concepts.
