>>hexer2+y4
You can't just "do good" like it's a spreadsheet, managing your karmic balance as the parent comment joked. You're only worrying about your personal consequences in that model, not the harm to others.
But I think it should be possible for a human to reflect on their actions, find remorse, and strive to do better in the future. They will always have done a bad thing, but they might not always be a bad person.