Restricted shipping on countries alone does not work

If you allow a country and then select an order and choose a state, then the state will prevail. In my case, because I only need per country restriction, this is a problem.

So I unchecked:

// Explanations of Failure if Raised
//Simple Global Failures
  if (count($fail) != 0) {
    foreach ($fail as $reason) {
    switch ($reason) {
        case 'country':
        form_set_error('', t('We are sorry to inform you that we do not ship selected item(s) to your contry: @country. Therefore, we cannot proceed further. Please read our shipping policies and review your order.',
          array('@country' => $country->country_name )));
      break;
//      case 'zone':
//        form_set_error('', t('We are sorry to inform you that we do not ship selected item(s) to your state/province: @zone. Therefore, we cannot proceed further. Please read our shipping policies and review your order.',
//          array('@zone' => $zone->zone_name )));
//      break;
      }
    }
  }

It seems more interesting to select a country as a whole OR to select states inside a country. But not both. An make countries prevail on states.