You're unfairly judgemental. Many of those guys get bikes from places like JOIN or other social service agencies who recognize that having a bike is a major economic advantage if you're homeless. They also make and give away trailers.
And I wouldn't be surprised if there is a stolen bike somewhere in Dignity Village, but it's equally likely that there is a stolen bike in any 'better' class neighborhood. If you can get law enforcement to search an equivalent number of homes in the west hills as there are camps at dignity village and you don't find a stolen bike, I'll buy you $100 worth of hot dogs at Roakes. For instance, it's pretty unlikely that the bikes stolen at the southwest Bikes burglary (http://bikeportland.org/2011/08/30/u...op-theft-58329
) are doing time hauling scrap steel.