On the other hand, we could also explore what others might do to justify Harry's death. Suppose, for example, that Rowling let Howard Dean write the last volume. We could then get treated to Voldemort as a misunderstood victim, or perhaps a bad guy but no worse than the arrogant and arbitrary Albus Dumbledore, who tried to control the wizarding world just as surely as Tom Riddle. Why, Dumbledore taught Voldemort almost everything he knew! And the Ministry of Magic spent years denying Voldemort's danger, so obviously they are to blame for all that has happened, not the evil wizard (as if there is any such thing as evil). Harry, therefore, is little more than a fool that chose the wrong horse and got himself killed for it. Good thing, too, because if he survived, he would get blamed for all the deaths that occurred just because he found it necessary to oppose Voldemort.
Now that would make one creepy ending for a delightful series.