Wizard's Seventh Rule
Wizard's Seventh Rule: Life is the future, not the past
I.E. Just because years ago a person did something that is totally wrong to you doesn't mean they are that bad now. People change as they mature.
...or...
Or if people make mistakes in their past it doesn't mean the same ones will be remade. People learn from mistakes judge them by what they do now not what they did. The older you grow the more you learn...