It's like this, I'm British. While I don't live in G.B. I still think of myself as being British. The thing is The Republic is American and the sith have British sounding voices. The Sith are the bad guys in this game. Even though I play them.
Should I therefore be affronted that the makers of this game have used British sounding voices for the sith?
Was like that in the movies which is why it's like that in the game. If placing blame is important (this is a forum so of course it is) then blame the IP. Is Green Bay a popular place for Brits to live?