And if a person is making a change of behavior can't he be pardoned and give him or her a second chance?

Exercise a lot of forgiveness. People shouldn't be "permanently branded" as a result of small mistakes from which we've all moved past. Oftentimes, people get a rating due to unknowingly acting a bit outside of the community's consensus on appropriate behavior, and such ratings may indeed be appropriate. But if they correct the problem and don't seem likely to do it again, remove the rating or replace it with a neutral. Even if someone refuses to agree with the community consensus (ie. they refuse to back down philosophically), if they're willing to refrain from the behavior, their philosophical difference should not be used to justify a rating. For example, in the YoBit mass-ratings example above, ratings should be immediately removed after the person removes the signature, even if they maintain and continue to argue that they didn't do anything wrong. If someone agrees to "follow 'the law' without agreeing to it", that should be enough.