Why God creates people he foreknows will reject him

Mike offers two responses. First, God's glory is an end in itself (a point Mike credits Calvinism for emphasizing, though he believes it is simply biblical). A person freely rejecting God in the exercise of God-given free will still glorifies God — it is a tragedy but not an injustice, analogous to a husband who marries knowing his wife will leave yet commits fully to love. Second, if God had only created those who would receive him, most people who now exist (including Mike himself) would never have been born, since their ancestry includes people who rejected God. The present world of "wheat and tares together" is the world in which believers exist and were born.