Yes I think it was because if V wasn't killed then the uprising wouldn't haven't meent as much to everyone.It shows how he believed in what he was doing enough to even give his life for it.
However, the vast majority of the public was never told that V died. Only Evey and Finch really knew for certain. Then Evey took up the mantle. If you're referring to the readers/audience as "everyone", however, then I can understand.
Of course it gave it impact, otherwise the ending would of been dul if V, the girl and everyone in the town rose up against the government and then thats it
To say that any given twist of plot is 'necessary' is to stifle imagination and creative freedom. It would have been a perfectly legitimate ending to have V survive, marry Evey and live happily ever after. But then again, this is an ALAN MOORE comic! And for him, this is pretty cheery. Cheerier than Watchmen anyways. At least the hero wins, even though he dies.
"Anarchy wears two faces, both creator and destroyer. Thus destroyers topple empires: make a canvas of clean rubble where creators can then build a better world. Rubble, once achieved, makes further ruins' means irrelevant. Away with our explosives, then! Away with our destroyers! They have no place within our better world."
Page 222 of the V for Vendetta comic, answering this question before it even came about.
"But let us raise a toast to all our bombers, all our bastards, most unlovely and most unforgivable. Let's drink their health...then meet with them no more."
