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).
Someone leaning on the “everything happens for a reason” in a counseling context is gross - I almost took a swing at someone bleating that when my wife died.
I will say, that while I've read a lot of these sorts of books, they've mainly helped me identify my predispositions in temperament, my blind spots, etc. If you really press a therapist on the question, they will tell you that the only real way to 'treat' this is having loving and stable friends and romantic partners. I imagine being religious can help as it grants you easy access to a welcoming community, and frankly 'god' is the ultimate parental figure for those that believe.