What does 'have to believe the best of people' mean in this passage?<br/><br/><a class='_ac _lb' lightbox='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/2237560.0_rz28z4mpx5xw.PNG '><img class='_ac _di img-fluid' style='width:421px; height:inherit; background: inherit;' data-delaysrc='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/2237560.0_rz28z4mpx5xw.PNG' src='https://uat-englishforward-forums-backend.s3.us-west-2.amazonaws.com/2237560.0_rz28z4mpx5xw.PNG' /></a>