I weould like to remind everyone that one is MECHUYAV to be dan AYC lekaf zechus until it is clarified one way or another.
My Rosh Yeshiva ZT”L used to quote the gemara from Derech Eretz Rabbah perek 5, where even though one is dan lekaf zechus, you still have to take precautions and be chosheid every stranger even without being mekabel.