Here's a scary bit:
Surveys of several thousands of people in Britain, the United States and elsewhere have found that rates of paranoia are slowly rising, although researchers' estimates of how many of us have paranoid thoughts varies widely, from 5 percent to 50 percent.
You have to wonder if the Brit study is less likely to be replicated in the U.S., particularly given the amount of people using the tube in London. I wonder what those other people are thinking and doing too when I'm waiting or riding on the tube.
As one guy says, maybe it's not such a bad thing:
"In a world full of threat, it may be kind of beneficial for people to be on guard. It's good to be looking around and see who's following you and what's happening," Combs said. "Not everybody is trying to get you, but some people may be."
Essentially people are suspicious, and given the times who can blame them? If there is a rise in paranoia that's easily explained given 9/11, given the attack on the London tube and buses, given the times in general. So in this case, what people know is that they know, or think they know, someone is out there watching them.