The Five Fingers

They say none of the five fingers were made alike because each have a purpose of their own. So we can guess the origins of the "har ek friend zaroorii hota hai" concept.... any how is that reason enough to justify the varied personalities rambling around. And even if it is how do you put up with the most unwanted ones? Why do people who are not worth as per our judgement, bug us so much then? They must have some function of their own right? Still why does it become near impossible to accept them for what they are? Making it a herculean task to maintain decorum in the presence of the clique