Bring back democracy, then blow-up Parliament?
Okay, so you just took-down the facist dictatorship, and the people will settle for nothing less than a rebirth of democratic freedom. So you destroy the UK's greatest symbol of democratic freedom?!
Yeah, I heard the nonsensical lines "This country doesn't need another building. It needs hope." and "blowing up a building can change the world."
I guess, given the whole Guy Fawkes thing, the movie makers had to blow-up Parliament, even though, within the context of the movie, it's pretty stupid. The country will just have to build a new one.
But, hey, it sure looked bitchin!