Nobody wants to take any blame for sin. It may be relabeled, so that it is not acknowledged as sin at all. It may be considered a matter of sickness, deprivation, ignorance, or perhaps social mal-adjustment at worst. Another way of denying our sin is to admit the wrongness of what we have done, but to decline to take responsibility for it. Erickson goes on to list 11 consequences of sin.
Sin has serious consequences.
It seems prudent that every Christian would want to learn how to get a grip on sin. In this story we see a man who did all the right things, and yet he discovered sin in his heart that he didn't know was there. Perhaps we can learn from his experience. The young man came running before he missed him. He had an important question for Jesus.