Is that really the case?
From personal experience I know my doubts aren't simply unfounded. Old habits are hard to get rid of, if at all possible. Sins can be forgiven perhaps, but it's impractical to totally forget what people have done to us due to their character flaws---and vice versa. It's just the natural thing to do to cover our asses.
A return to innocence? Let's just say we're all dirty washcloths. The water used to supposedly launder us of our adulterations unfortunately can't be drained and changed.