That is a really good question.
And, for arguments sake, why does God create people who are serial killers.
He dosen't. It is that old Free will thing. Most of us have a love-hate relationship with freewill. We like it when it suits us, but when others make a choice that affects us in a negative way, we wonder why God didn’t stop it.
I do not pretend to have the acceptable answer. But I do know that God is good and that He is on our side!