The fact is that disease and suffering are a part of the human condition. Neither Mark in telling the story nor Jesus in healing the man related the illness to his personal sin. He had two problems, and Jesus resolved both. On one issue, the religious leaders and Jesus agreed. Sin is a serious offense against God, and sinners need forgiveness which only God can provide.
People today are less concerned about the sin problem.
It is the downgrading of sin that makes us not participate in the tough work of bringing others to Jesus. When it comes to people of other lands and other religions, our culture assures us that there are many ways to God, so we shouldn't worry about those folks. Jesus could have responded only to the man's physical need. However, He chose to speak forthrightly about sin and forgiveness. He also chose this moment to affirm verbally, powerfully and definitively that He had the authority of God at His access.