Being a good person isn't the same as being a person that is Saved. So maybe it should be phrased: Why do bad things happen to Saved people. Somethings that we preseve as being bad is actually for our own good.
By the way I read the book. Did you Sock Puppet? Just asking because you asked this question.
Yep, read that book. Been involved in lots of studies over the years. Asked myself the question many times. Asked God. Got angry with Him. Listened, heard (there is a difference between the two) and now understand. Made my peace. I hope you have.
As to your phrasing--saved people vs. good people. Well, one could make that distinction, true, but the question as it is usually phrased uses the "good" terminology, hence my use of the same.