God has no plan B. If he did then he would not be sovereign over his plan A. God was sovereign though evil happened to Joseph (Gen 50:20), Job, and even to his own Son (Acts 2:23). All things work together for good--though us finite beings do not always see the good or the big picture as designed and carried out by God.

Christians hurt other Christians all the time--look at the OT--Joseph bothers hurt Joseph, Job's wife told him to curse God...., the disciples deserted Christ and so forth. However, in all this God is not the author of sin, though you might say squeezes the good from each incident, even at the cost of some "temporary" pain to us. Remember what Paul said,

Quote
2 Cor 4:14 Knowing that he which raised up the Lord Jesus shall raise up us also by Jesus, and shall present us with you. For all things are for your sakes, that the abundant grace might through the thanksgiving of many redound to the glory of God. For which cause we faint not; but though our outward man perish, yet the inward man is renewed day by day. For our light affliction, which is but for a moment, worketh for us a far more exceeding and eternal weight of glory; While we look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.
What a great God we serve since even in evil he can make good for his own glory!.

Reformed and Always Reforming,