I don't know why people raise this silly issue. I don;t care where people go... even Siberia.. so what? It's a person's choice... if really he wants to go to USA... he can go by hook or by crook. Who cares? It's the USA who issued the visa, and when person left Nepal Airport, it's Nepal Govt to decide if the person shold fly or not, and once the person reaches USA, it's USA law which decides whether a person is living in USA legally or illegally, and take action accodinly.