One of the major issues with shame is that it blocks the essential process of recognizing and repenting of sin. This may seem counter-intuitive. Shame-filled people feel bad about themselves and feel they do wrong all the time. Shouldn't they be overly sensitive about their sin?
The answer is no. At least, not in the right way.
As Christians, it is unfortunately not the case that we arrive at a point where we never have to deal with any remnant of the sinful nature. While transformation, growth, and maturity are definite realities, and genuine change is not only possible but an essential sign of someone who has been truly born again, we will continue to be ambushed by our sinful nature while we're still living on this earth.
For my thoughts are not your thoughts,
neither are your ways my ways, declares the Lord.
For as the heavens are higher than the earth,
so are my ways higher than your ways
and my thoughts than your thoughts. (Isaiah 55:8-9)