well in this day and age of global terrors you cant afford to make such mistakes mate.i am sure there must be something dodgy becoz nobody simply forgets to get a visa. how can somebody even sympathise with you when you dont have a valid visa to enter a country. just imagine what would US the country of your children would have done in somebody entered wihtout a valid visa.
no country can make exceptions. u cant make exceptions. if he had allowed you then it would amount to emotional bribary. and you would say india is a corrupty country.