judgement --> mercy
sin --> weakness
homo as normal --> homo as abnormal
sex sin be permitted --> sex sin be understood
born this way --> not stop virtue/finding cure
sex sin is other than habit --> sex sin is habit
I think in this imperfect world those two opposites will go with each other. If you choose the left and insist on it, you'll receive judgement. If you choose right and live it, you'll receive mercy.
Thus we receive mercy because sexual sin is a weakness, an abnormality, and it should be understood. We don't stop finding a cure for it and mastering chastity because it is a vice (by repetition, psychological, spiritual, and not just material or bodily).