How is it fair?

How is it fair? How is it fair that a women who was a great person had to die, because of something like a bloodclot? BUT yet somewhere out there some child is getting abused, some women is getting slapped because of something dumb and someone could be killing someone? How can horrible evil people like that get to see another day when my cousin doesn't? I mean she has 2 daughters who need her, a husband who needs her and grandkids! She used to say she was excited about christmas's now because of all the kids. She was excited about all the new babies that were in our family. I just can't seem to understand and you know what? I don't think I want to.