"My concern is that this isn't 1930. People aren't interested in trading work for food. They aren't interested in trading one commodity for another. The people of the 2000's are interested in being given something for nothing. In 1930, a down-on-his-luck fella from the city would have knocked on their door looking to exchange a little fencing for a bowl of soup. In 2010, the punks knocking on their door won't be interested in either their fences or their bowl of soup. They will want it all... We have a nation full of angry, indolent people just looking for a reason kill and destroy."
Here's a serious post by a friend on the subject of preparing to deal with unwelcome visitors during hard times. It's well worth reading.