Houston attorney Mark Bennett explains the principle duties of the Defense/Prosecution attorney relating the presentation of the character of the accused. There is also a great life lesson here as well.
Fundamental attribution bias is the cognitive bias that leads us to attribute people’s actions, good or bad, to their character rather than to circumstances. A person of whom we have no opinion and for whom we have no ingroup/outgroup associations leading to an opinion, but whom we learn has done a bad thing, we generalize1 as a bad person; such a person who does a good thing, we generalize as a good person.
This is why you get at most one chance to make a first impression.