Paralyzed

According to the Gospel of Mark in the Bible, Jesus was in Capernaum when a group of men brought a paralyzed friend to see him. Most of the people around Jesus assumed that the paralyzed person was guilty of some sin, and they were afraid of sin. Jesus told the man that he was forgiven. Then he told him to get up and walk.

When someone has a difficulty that we do not share, we may assume that they did something bad to make it happen. Is this fair?