In logic, if a hypothesis leads to a conclusion, then negating the conclusion would necessarily negate the hypothesis. For example, if it is raining, the grass would be wet. If the grass is not wet, then it cannot be raining. The conclusion is irrefutable. Jesus has said in Mark 2 and Luke 5 that he had come not to call the righteous to repentance but sinners. If we are all righteous, we would have no fear and welcome Jesus. But since so many of us avoid facing him, it must be that they are sinners afraid for themselves. Logic does not lie.