Blaming God

The question was asked in Bible study -- why do we praise God for the good things in our lives, but not blame him for the bad stuff?  I fumbled for an answer to this relatively simple question, but as I've thought more about it, I feel I've arrived at more of an answer.  God is good all the time -- he is on the side of good, and he wants the best for his people.  He allows us free will, though, to make decisions that result in terrible consequences.  He is allowing the world he created to consistently act in opposition to his will, because he wants to save a remnant of his people -- he would like to save everyone, but he gives us choices that allow us to wander from his will.  The example of Job was brought up in Bible study -- Job loses everything, including his family, his health, and his wealth, and he beseeches God for pages and pages, demanding to know why he is being handed these terrible blows.  God's answer to Job is basically, who are you to question me?