«V»

— Is it meaningless to apologize?
— Never.

No, what you have are bullets, and the hope that when your guns are empty I'm no longer be standing, because if I am you'll all be dead before you've reloaded.

— Who are you?
— Who? Who is the form following the function of what, and what I am is a man in a mask.
— Well, I can see that.
— Of course you can. I'm not questioning your powers of observation, I'm merely remarking upon the paradox of asking a masked man who he is.

— Die! Die! Why won't you die? Why won't you die?
— Beneath this mask, there is more than flesh. Beneath this mask there is an idea, Mr. Creedy. And ideas are bulletproof.

The building is a symbol, as is the act of destroying it. Symbols are given power by people. Alone, a symbol is meaningless, but with enough people, blowing up a building can change the world.

— What was done to me was monstrous.
— And they created a monster.

Disdaining fortune, with his brandish'd steel which smoked with bloody execution.

«V»: — Violence can be used for good.
Evey: — What are you talking about?
«V»: — Justice.