Why do you think so many actors are only half-developed people? It's very easy when you're a young actor to have these intense, explosive friendships for short periods of time, because you can control what's shown of you. Then you go on to your next job and reinvent yourself again. I think it's important to find something constant.
Of course the lower classes have always felt downtrodden and aspired to a better life. But there is this theory that people respond to a class structure in England - there was a time when people knew who they were and knew whom they served and as long as management wasn't abusive, it was a good life for people.
Quiet people, people who aren't given to emotional outbursts, people who are economic with words - they're also fun to play, but you find yourself needing a laser precision in those roles. Otherwise you just sort of stand around, looking slightly brain-dead. You worry about being uninteresting.