From the official GodisOpen Facebook group:
As Open Theists how do you reconcile the problem of evil?
God did not create the world to micromanage. When we have children, if we ensure they would never feel pain we would be defective parents. Good parents allow their children to branch out, even being hurt at times, even allowing them to hurt others. Evil exists because God did not want to create robots. God wanted relationships with real people.
Isa 45:18 For thus says the LORD, Who created the heavens, Who is God, Who formed the earth and made it, Who has established it, Who did not create it in vain, Who formed it to be inhabited: “I am the LORD, and there is no other.