If God wanted to create a world where love would be a reality, freedom must be aswell. And thus the ability to say no, to turn away, to rebel against the love one has been created for. The alternative to create a free man that cannot fall doesn’t exist.
Not even God can do the logically impossible. A free man that cannot fall is as contradicting as a round triangle. In order to give us the reality of love, God must also give us the possibility of evil.
