An American friend told me that in the early days of the US railroads that certain undesirable people were actually exiled from towns, not because they were criminals, but had rather high hopes and exceedingly low morals. Therefore their influence or behaviour, very often towards the young, was eventually tolerated no more and they were asked (told) to leave the town. Some were even tied up and thrown onto a train, very often in a cattle truck. If they came back, life was made very difficult for them, so many chose to start their new lives elsewhere. I suspect also that many were itinerant types anyway.