No, they are waiting in security lines to get into the station. My wife goes through it every day, I just won't even bother.
I found the Beijing subway to be far nicer than the ones found in major American cities. No surprise since it's much newer.
I know there were some issues with Muslim separatists, but they didn't seem to even rise to the level of US terrorism threat. We do airport theater but not bus/subway theater, even in NYC.
God forbid if you ever have to transfer at xizhimen; I never thought it was possible to wait in line so long to take a subway.