I hope the reason given was something like "people have free will and sometimes they use it to do evil" (which is why forgiveness is a thing), and that "God has a plan" includes a plan to heal and restore (for instance, Jesus saying "I came that [my sheep] may have abundant life" or "I came to destroy the works of the evil one"). If it's just "everything happens for a reason" but nothing more, that's basically saying "I don't know how to help you".
Possibly off-topic rant: If the reason is "it was God's will, because God is sovereign and therefore everything is his will", I think that is bordering on function heresy. Christianity (and life) has all these tensions: God is one, but God is three; Jesus is a man, but Jesus is God; God is sovereign, but he gave us free will. The temptation is to resolve the tension by cutting off one of the ends of the tension. The original heretics chopped off one of the ends of the tension about Jesus: Jesus was only man and not God (for example, Adoptionism, Arianism) and Jesus was only divine and not man (for example, Docetism, Apollinarianism). The view that evil is God's will is similarly chopping off our responsibility, so it is doing the same thing that the original heretics did. In my view, the biblical view is that people doing evil is NOT God's will, but what he wants to achieve requires that he give us free will (and his plan of resolving our choice to do evil is to put his spirit in our hearts).
Possibly off-topic rant: If the reason is "it was God's will, because God is sovereign and therefore everything is his will", I think that is bordering on function heresy. Christianity (and life) has all these tensions: God is one, but God is three; Jesus is a man, but Jesus is God; God is sovereign, but he gave us free will. The temptation is to resolve the tension by cutting off one of the ends of the tension. The original heretics chopped off one of the ends of the tension about Jesus: Jesus was only man and not God (for example, Adoptionism, Arianism) and Jesus was only divine and not man (for example, Docetism, Apollinarianism). The view that evil is God's will is similarly chopping off our responsibility, so it is doing the same thing that the original heretics did. In my view, the biblical view is that people doing evil is NOT God's will, but what he wants to achieve requires that he give us free will (and his plan of resolving our choice to do evil is to put his spirit in our hearts).