…benefits you more than anyone else.
It makes for a happier life, and you see the brighter side of people.
When there is doubt, and you approach with the assumption that they meant well rather than with malice, then you enter into a more open dialog. You let down defenses.
If you are wrong, that karma belongs to the other person and you move on. Assume good, and you raise the chances of good. This doesn’t mean don’t do due diligence, but it does mean don’t transfer past experiences onto others, nor unfairly judge others. There is more potentiality in relating this way, and the possibilities open much more in your favor.