Benefit of the doubt
To give someone the benefit of the doubt is to default to the belief that their intentions are honest, and not assume malice when there is uncertainty or doubt surrounding the circumstances.
Example:
John didn't pay me back the $20 he owes me, but I'll give him the benefit of the doubt that he simply forgot and isn't trying to rip me off.
John didn't pay me back the $20 he owes me, but I'll give him the benefit of the doubt that he simply forgot and isn't trying to rip me off.