I was just reading that more athletes have gone missing after the games. I can relate to their mindset I must say. If there was a land far richer than England where I could easily work illegally and send enough money home to improve the quality of life for my entire extended family I wouldn't think twice about staying. That's just the economic factor, add in the fact that my country was a war-torn place with deep poverty and I'd be practising sport from an early age.
Obviously I'm not saying it's logical to just throw open the borders, just that put me in the same boat and I'd have no shame in living illegally.