Ghetto inviroment doesnt make you physically tougher, it prolly adjusts your attitude though (depending on who you are). What makes Ibra like more tough, beside attitude shaped from such inviroment (as Byrone said, not like its what determines what person you are), is because the fucker is frigging tall and strong. its not like thats an insignificant detail or such.
And FYI, Swedish "ghetto's" is the dreamlife for most of the world, so lets not over sell that bit too much, mmkay? (Reminds me of the K'naan song "whats hardcore", hehe).