The homeless here do it for food. There is a whole network where they trade what they found for what they want. Burgers for donuts, or bagels for fruit. We did a story on it a number of years ago. Yes it is illegal, but it is the only way they eat. There are some very caring fast food workers who make it know to the homeless that they take the wasted food out at a certain time, and place, and they set the food out neatly wrapped up for a moment before they come back to put it in the dumpster, and gee it's gone!