This expression connotes that one is willing to not insist on accusing someone of a mistake despite most evidence pointing to that someone as being responsible. As in a legal proceeding where the jury feel there is a reasonable doubt the defendant transgressed the law
More colloquially, when not understanding why someone took a certain action or made a decision that impacted others negatively, this expression means one doesn't impute bad motive on the someone.
For example, someone says something very insensitive to you that hurts you, it might be a delicate situation or something very personal. If you give them the benefit of the doubt you don't feel they had bad motive but were trying to help or encourage.
How can I express this in Chinese?