A perfect stranger is someone you've never met, never talked to, been acquainted with--most likely never seen... And those circumstances are what make the stranger perfect--the complete lack of interaction. But with that uncontaminated, unaltered, clean-slated view of an individual, who are they to you but perfect? Let them be perfect. And perhaps allow that same courtesy to those you know all too well--without judgement or history--let them, in your eyes, be perfect. Mankind would be well served by such grace of thought.