The Lord is no respecter of persons, and He demonstrates this in His judgment of the favoured southern kingdom. The Lord is just in His judgment regardless of the identity of the guilty.
Uzziah was a great king and was greatly blessed of the Lord. At the peak of his strength, he began to trust in himself. His strength led to his fall. It is often in times of perceived strength that saints of God become most vulnerable.
We begin to be comfortable with our salvation and begin to think it is our due. But we were due nothing. We all deserve the lake of fire. Yet, we have a God who specializes in saving the seemingly unsaveable.
Many families have problems with one member turning against another. This is the direct result of the coming of sin into the world.
