If God simply permits it to happen, it is still God's fault. In Genesis 3 we are told that the evil one tempted the first woman to defy God. The evil one very successfully played with her mind. She followed her imagination to suspicion and to desire. Temptation intensified desire, and intense desire led her to defy God.
Evil always seeks companionship.
From the context it seems that the first man listened as the evil one played with his wife's mind and desires, and said nothing. It also seems that he went with her to the forbidden tree. When she ate the forbidden fruit, all she had to do was hand him a piece. The first man was hardly an innocent victim who had no idea about what he was doing or what he was eating. The awareness of evil had immediate impact on both of them.