This was Piper’s response to a question put to him in an interview in the Christian Post:
Why was it right for God to slaughter women and children in the Old Testament? How can that ever be right?
Well, that is a very good question, and it has no simple answer. To be fair to Piper, he does go on to explore in more depth some of the issues of why large numbers of people die, and why God has sometimes commanded people to kill them. In this post I make no attempt to offer my own answer.
Piper’s main argument is that God has the right to do whatever he likes. Well, I would accept that God has the power to do whatever he likes. Unlike the gods of the ancient Maltese, he is not constrained by some higher concept of Justice – and Piper would be right to reject any suggestion that Justice constrained God to send his Son to die on the cross.
Nevertheless, for God, just as for humans, might is not right. The determining factor for what it is right for God to do is not that he is almighty, but his character, defined in such terms as love and justice. He has made this character known to us in the created universe, in the Scriptures, and above all through his Son Jesus Christ. In the same ways he has also revealed to us how he expects us to live. And since goodness and consistency are part of the character he has shown us, it is no surprise to find that, in general terms and making allowances for human limitations, what is good and right for him to do is also good and right for us. Certainly we see no sign of Jesus doing things which it would be wrong for us also to do.
By contrast, the God described by John Piper has the character of an arbitrary despot, one who asserts the right to do whatever he wants, even when this entirely contradicts the standards of behaviour he expects from others. It rather seems as if the deity that he worships is not in fact the God and Father of Jesus Christ.