I often wondered about the dilemma of God’s love for sinners VS God’s happiness. As God loves us as much as he does, how could he have all this joy while seeing people sin? First and foremost is that the person committing the sin is increasing their hell. Secondly the victim suffers some physical and or emotional problem.
While on my mission this dilemma hit me quite strongly, at one point. At that time we had been sent out to a smallish town. One of our jobs was to assist the local branch, which only had one Melchizedek Priesthood holder. There were several families without member husbands. One had 2 females (18 and 16). The 18-year-old had been romantically interested in a missionary who went home and hadn’t written to her since. She chose an interest in me, but I discourage it. She got upset and left the church, along with her sister. This made me very saddened, as she had been quite enthusiastic. I felt a deep love for her as a person. In the process of this something happened that amazed me. While feeling all this sadness and love, my heart swelled within me by the love I felt. It raised me to a greater level than I had ever experienced. I felt almost guilty that amidst all my sorrow for her I felt so wonderful. The more I felt the sorrow and concern, the greater the wonderful feeling.
This answered my question. I had come to understand how God can have joy inside, in spite of all he has to put up with from us. In fact it is having us, and helping us through, that increases his joy.