I don't know for sure. I have to take the Gospel of Mark in the context in which it was written. Mark was written about a decade or two earlier than Matthew and Luke. I think it more historical and therefore more accurate. In Mark, Jesus' family believes he is crazy. There were no stories about his infancy. Maybe they weren't created yet? The infancy stories are more about showing us who the writers thought Jesus was rather than history. 
Many of the people healed by Jesus were people who were excluded by their community because they were labeled as sinners and felt deep guilt. Jesus looked at these people with compassion and forgave them because they had the faith to seek and trust his healing powers.