Why do bad things happen to good people?

(This was written at 3:00am. Please forgive the rambling and lack of coherency)

It's the age-old question. You have wonderful people that do everything right, and bad things happen to them. What's up with that?

There is a family in Chicago, that has a wonderful set of parents and four gorgeous children (I know this because the mother is my sister). Last night, my parents and I went down to visit them at 9:30pm. We dropped my mother off at my sister's at 11:00 and drove to Children's Hospital to visit my brother-in-law. He was there with my niece - his 6-year-old daughter - who had been diagnosed with Leukemia just a few hours earlier.

Bad things don't happen to good people. Everything HaShem does is for the best. It's just sometimes very difficult to understand.

Update (10/11/2006): My niece's name is Rena Sima bas Danya Penina.