"People should not be afraid of their government; the government should be afraid of their people." -V
In V for Vendetta, there is betrayal, treason, and a passion for what is right. V is taking on his own violent vendetta. In an unusual way, V tells his story to a woman (Evey). "The only verdict is vengeance.. violence can be used for good." He wants to change the way people see their government, and and put a stop to all the wrongs.
In a way he ends up doing this but in a negative way. Evey understands him and understands why he does what he does. Together they possess a lot of passion.