Why would got let such a terrible thing happen?

The story of Moshe Yosef Daum and Fela Nussbaum is similar to the book of job in many ways and thoughts. One thing that is similar in both theses religious stories is the question why would God let a thing so terrible happen. In the book of job, God killed jobs family and made him suffer for no apparent reason. Why would God do that? Does he like watching people suffer? Is that why he created the Haulocaust that killed millions of people. Although he stores are similar in a couple ways, they also differ. One way they differ is the Haulocaust is proven to happen but the book of job isn't. I believe that the book of job was a reality at one point. Do you?