Build confidence in others, build confidence in yourself
The benefit of the doubt is a powerful force. With it, you are placing your trust in others and assuming the best in them, which you should be at least aiming to do anyway.
There may be times when this trust is tested, and in those times you have to be brave enough to know the difference. But for everything else, the trust built from the benefit of the doubt leads to confidence which leads to greater potential for better.
Build confidence in others, build confidence in yourself with the benefit of the doubt.