Comment by midoridensha

Do you mean because they're poor? There's plenty of poor people in Japan, but they don't resort to stealing people's phones or wallets. Again, it's cultural. And it's not just America; over in Europe where there's a far better social safety net than America, petty theft is commonplace, especially pickpocketing (which, to America's credit, is almost unheard of there, which again shows this stuff is cultural).