Because when you created couple that what happen !! People doesn't want to see Hermione (the clever) to be married to Ron, for them Hermione should marry Harry (the chosen one) ! For the same reason they hate Ginny !! And JK Rowling know that people will love the epilogue and other don't !!
The Parisian cinema "Reflet Médicis" make, for few days, a restropective of the movie in competition at "Un certain regard" in Cannes The Bling Ring will be shown for 2 seances (which confirm that the movie was in competition like the dozen of french articles i read about this) It will be shown Saturday at 8 pm and Monday at 1 pm hope will have some reviews about fans